| Bipeds_and_Prime_Numbers Graduation address by former professor of philosophy Garrett Barden. Mentions primes as sign of human curiosity. (September 18, 2001) |
| Chair_of_General_Chemistry,_Altai_State_Technical_University Describes scientific work and educational programs, lists group publications. |
| Department_of_Chemistry Contains online course material and lists faculty members. |
| Earth_Measurement_Corp_ Near-surface geophysical data acquisition, processing and interpretation. |
| Electro-Seise,_Inc_ 3D airborne micro gravity/E surveys for subsurface hydrocarbons. |
| Fairfield_Industries_Incorporated Fairfield is a geophysical company known for its development and use of advanced technology for acquisition and processing, and its licensing of seismic data. |
| G_A__Ryzhikov_and_M_S__Biryulina,_Consultants Special processing for traditional marine data using "Partial Synergetic Imaging-", or PSI-criterion. |
| Getech Geophysical contractor providing gravity and magnetic services and products to the international oil and mining industry. Offices in Leeds and Houston. |
| Gibson_Consulting Interpretation of gravity & magnetics for hydrocarbon exploration. |
| Input_Output,_Inc_ Provider of land, marine and reservoir seismic instrumentation. Includes comprehensive data sheets. |
| Interactive_Interpretation_&_Training,_Inc_ Outsourcing geoscience for the upstream petroleum industry: geophysics, geology, petroleum engineering, geochemistry, workstation rental. Landmark and GeoQuest software. |
| JGI,_Inc_ Acquisition of seismic and other geophysical data, geothermal surveys and remote sensing. Japan based. |
| Meridian_Surveys Survey and geophysical consultants to the oil and gas industry. |
| Montason_Exploration_Inc_ Geophysical acquisition, processing and interpretation. Electromagnetic technology produces virtual subsurface conductivity log. |
| Oilsearch_Plc_-_Airborne_Geophysical_Oil_Survey_Company Airborne geophysical oil survey company specialising in remote fluorescence sensing and magnetic data recovery. |
| PGS_Geophysical Onshore and marine seismic acquisition and analysis. Reservoir imaging, characterization and monitoring. Multiclient 3D data library. |
| Reid_Geophysics Offering gravity and magnetic survey specification, processing and interpretation. Proprietary software. |
| RGR__Method_of_Effective_Specular_Points A novel approach to Reflector Geometry Reconstruction: proper assimilation of prestacked multioffset traveltimes, macro-model-independent seismic reflection (depth) imaging. |
| Seismic_Consultants_Group_Pty__Ltd_ Seismic Consultants Group (SCG) provides personnel for field supervision and quality control of geophysical surveys to the oil and gas exploration industry worldwide |
| Seismic_Imaging_Research Research reports on subsalt imaging, depth migration, velocity model building, seismic modeling, converted mode energy and overpressure prediction. |
| SeismicDocs Online professional geophysical consulting service. |
| Seismograph_Rental_,_seismic_tomography_services Passive seismic tomography services for oil exploration. Seismograph and vibroseis rental. Pipeline pollution early warning systems. Seismological investigations. Crosshole seismic tomography. |
| Seistronix_RAS-24_Exploration_Seismograph Seistronix manufactures, leases and sells exploration seismographs and related geophysical equipment for oil, gas, mineral and general geotechnical exploration using seismic refraction, 2D and 3D seis |
| Sharp_Deconvolution_in_P-tau_Domain Elimination of intrabed multiples: SoSI-inversion. Site shows a novel approach to the comprehensive elimination of multiples -including intrabed ones. It is based on recursive representation of Born s |
| Signature_Seismic_Processing_Inc_ 2D and 3D seismic data processing services for both land and marine datasets. |
| Society_of_Exploration_Geophysicists Home page of the SEG, which hosts 2 monthly publications- The Leading Edge and the SEG Journal, and yearly trade shows, at the international, national, and regional level. The major organization for g |
| Sources_of_Seismic_Interpretation_Error Powerpoint presentations illustrating common reasons for interpretation error. Free viewer available from site. |
| Sperling_Geophysics Seismic data acquisition, interpretation and modeling, including prospect evaluation. |
| Topaz_Energy_Exploration_Ltd_ Geochemically-based surface exploration for hydrocarbons using magnetic horizontal gradient and radiometric surveys |
| A4_Scientific,_Inc_ Small business offering analyses of volatiles, semi-volatiles, metals, pesticides, herbicides and explosives. Lists facilities, analytes, and includes chain of custody form, and contacts in The Woodla |
| AAC_Trinity_Inc_ Article on sediment sample collection, methanol preservation for volatile analysis, and details of services, including industrial hygiene at NELAC accredited laboratory in Farmington Hills, MI. |
| Accurate_Labs An environmental laboratory primarily serving municipal and industrial clients in Oklahoma, Texas, and Kansas. Provides analytical support for all projects involving waste water, drinking water, groun |
| Accutest Environmental analytical and testing services. Based in New Jersey. |
| ACZ_Laboratories,_Inc_ Offer state compliant analytical testing, for inorganic and organic contaminants, such as mine and surface water quality and mercury in biota tissue. Details of organization and techniques range, with |
| Air_Toxics_Ltd_ California facility specializing in analysis of environmental air samples, including ambient air, source emissions, soil and landfill gas, and indoor air, for federal, state and private industrial pro |
| Alta_Analytical_Perspectives Specialists in the ultratrace analysis of dioxin and persistant organic pollutants in Wilmington, North Carolina. |
| American_Analytical_Laboratory,_Inc_ Offers analysis of air toxics, groundwater, wastewater, drinking water, solid waste for industrial hygiene analyses and consulting in Akron, Ohio. |
| American_Testing_Company,_Inc_ Offers turn-key services including legally defensible data, useful links and online ordering and payment. Contact and locations in three states besides Bedford Heights, OH. |
| Analytical_Environmental_Services,_Inc_ List of equipment and types of analyses performed, professional certifications, available service levels, and contact information for location in Atlanta, GA. |
| Analytical_Laboratory_Services,_Inc_ ALSI performs sampling and testing in support of environmental monitoring projects on soil, water, solid waste, as well as industrial hygiene such as lead, asbestos and air quality, at Middletown,PA. |
This page is sponsored by http://www.A-Wee-Bit-of-Ireland.com/.™Your source in the USA for the finest Irish wool sweaters, ruanas,capes, scarves, perfumes,caps and hats.All products made in Ireland.If you want many primes or larger primes, my JAVA prime number program might be better than this programbecause it will run on your computer instead of on my slow server.Or, you can download programs or source from my home page: http://www.rsok.com/~jrm/.If you only want thefirst 100 primes,they are athttp://www.rsok.com/~jrm/first100primes.html.http://www.rsok.com/~jrm/next_ten_primes.html will print the next 10primes after the integer you supply. If the graphics window is too small tohold the results, please check the JAVA console window.A sieve was used to generate a list of prime numbers. In order to reduce storage requirements, the information about prime or notprime was stored for 30 integers in each byte. Only one bit is neededto store prime or not prime for an integer. The value of the integeris known by the location of the bit.In each 30 integers, for N>= 1, the numbers that might be prime areN*30+1,N*30+7,N*30+11,N*30+13,N*30+17,N*30+19,N*30+23,N*30+29This means that information about prime or not prime only needs to occupy 8 bits. A ten byte file would hold prime or not prime for 300integers. It works because N*30 has 2,3,5 as factors, no matter whatthe value of N. (N*30)+3 has 3 as a factor since 3 is also a factorof 30. (N*30)+(x*3) also has 3 as a factor since it could be writtenas (N*10 + x)*3.The relationship used for this compact storage of prime numbers mightbe described by:(2-1)*(3-1)*(5-1)----------------- == 8 bits / 30 integers 2*3*5In a traditional sieve, one bit is used to store prime or not prime foreach integer. If one knows that the only even prime is 2 and stores thatinformation in the algorithm instead of in memory, then 1/2 as much memoryis needed. Using the notation above,(2-1)/2 == 1 bit / 2 integersBy not storing 3, then ((2-1)*(3-1))/(2*3) == 2 bits / 6 integers of the storage is required,(or, 1/3 as much storage as was required when one used a bit for each integer) but that is not as convenient for storage at 8 bits/byte.My 8 bits for thirty integers storage scheme could be extended to:(2-1)*(3-1)*(5-1)*(7-1)----------------------- == 48 bits / 210 integers 2*3*5*7which would be 6/7 of storage requirement of the method that I used. Ifextended to the next prime, then only 10/11 as much storage would be used,or 60/77 as much storage as I used.Enter two positive integers in the form below to get a list of primenumbers in the interval. I suggest not doing too large a range to avoidrunning your web browser out of memory. If you want all 98 millionprimes less than 2000000000, then I suggest downloading my sieveprogram. There are links to source code and binaries below. The sieveprogram will run much faster than this slow web server can deliver thenumbers to your browser. For example, my old 300 MHz AMD K6 took 1 hourand 33 minutes just to print the 367783654 primes less than 8000000000.If you want just a few hundred primes, this web server will be fairlyquick and it has all of the primes less than 8000000000. I have done aWindows version of the sieve program that will go to 8000000000, ormaybe further if you have enough ram. The 64 bit program is called sieve2310_64bit.exe. If youwant this for Linux, all that is needed is to change the unsigned longsinto long longs and change the printf formats and compile with gcc3.2 (or newer) or any C99 compliant compiler. sieve2310_64bit.cPlease limit yourself to a range of about 100000 to avoid connection timeouts. If you want more, download the program as mentioned above.The starting integer The ending integer More information about prime numbers from the University of Tennessee at Martin.More information about prime numbers from the University of Utah.An explanation of what prime numbers are from dr.math.Prime numbers as a sequence of integers at www.research.att.com.http://dmoz.org/Science/Math/Number_Theory/Prime_Numbers/ has many good links to web pages about prime numbers.Source code for asieve program from a web server,or embedded in html for easy viewing with Internet Explorersieve2310.c.html or ftp sieve2310.cor to ftp a 32bit ".EXE" file and source for Microsoft Windows sieve2310.exeThis program which uses (with permission) a small amount of my codecalculates various prime number statistics.http://ndirty.cute.fi/~karttu/matikka/Schemuli/primestats.c.txt.Find thenext prime number larger than an integer you provide. Thisis a JAVA program and requires a new enough JAVA in your web browserto include the java.math.BigInteger package. Source code is here.Find thenext ten prime numbers after the integer you provide.factor.exe isa Windows NT commmand line program to print the prime factors of aninteger. It may also work with Windows 98. Type "factor help" toget a usage message. It seems to work on integers up to about9007199254740989. bfactor.exe isanother Windows NT command line program to print the prime factors of aninteger. It will attempt to factor integers up to about 600 digits, but most will take a very long time, maybe many years. If the Windows 98command line is not long enough, bfactor will read one integer per linefrom stdin. 31610054640417607788145206291543662493274686990 is an easyinteger for bfactor.exe to factor if you want to test it without waitingtoo long. There is also a Linuxbinary of bfactor.John Moyer's home pageJohn Moyer's old home page with chemical thermodynamicssend email to John Moyer