| Aliquot_Sequences Juan L. Varona's work on aliquot sequences examines sequences with start values up to 10000, and traces them to large composite values. |
| Aliquot_Sequences Statistics by Wolfgang Creyaufmueller, including many tables and links to factoring sites and software. |
| Aliquot_Sequences Aliquot sequences arise in iterating the sum-of-divisors function s. Bosma has calculated tables up to start value 50,000 and 80 digits. |
| Aliquot_Sequences Results and software from Paul Zimmermann, addressing the Catalan Conjecture and working on the difficult "Lehmer Five" sequences. |
| Amicable_Numbers Observations on amicable pairs and their distribution, including Harshad and Happy Amicable pairs. |
| Cubes_of_Perfection From Ivars Peterson's MathTrek column in MAA Online. Curious relationships satisfied by perfect numbers. |
| Multiply_Perfect_Numbers Up-to-date information on multiperfect numbers and searchable database maintained by Achim Flammenkamp. |
| Odd_Perfect_Numbers_-_Missing_Values Status of various factorisations that would extend the known area of non-existence of odd perfect numbers, by Kevin Hare. |
| On_a_Generalization_of_Perfect_Numbers J. L. Pe introduces perfect numbers relative to an arithmetical function f. Under this scheme, the usual perfect numbers are just one among many species of "f-perfect numbers". Several open problems a |
| Perfect_Number_-_from_MathWorld Definitions and references. |
| The_Perfect_Number_Journey A Mathematics Enrichment Workshop introducing perfect numbers. Lessons and exercises extend over several pages. Aimed at interested middle and high school students. |
| Perfect_Numbers A detailed history of the quest for perfect numbers, from Euclid to their present-day Mersenne discoveries. |
| Perfect_Numbers Harry J. Smith's pages of the mathematics behind perfect numbers, aliquot sequences and Mersenne numbers. Includes program listings and e-mail archives. |
| Tables_of_Aliquot_Cycles Data for various kinds up to 10^12, including unitary, infinitary, exponential, augmented and reduced varieties. |
| Ancient_Pi__Knowers_of_the_Universe The concept of pi refers to the constant ratio of the diameter:circumference of any circle; irrespective of the number of degrees contained within that circle. An article in the "Science in Ancient A |
| Ask_Dr__Math_-_Pi Dr Math answers over 60 questions submitted by people about pi including questions on the Bible's relationship to it and its relationship to trigonometry. |
| Ask_Dr__Math__About_Pi Explains what the constant is and a brief history. Includes resource links. |
| Buffon\'s_Needle An analysis of its relation to Pi and a simulation by George Reese. |
| Calculating_Pi An open source endeavor for the calculation of this constant. Describes the project, the implemented algorithms for calculatinon and software downloads. |
| A_Common_Book_of_Pi Includes a brief history, a page with different formulas and a list of references. |
| The_Constant_Pi History, formulae, algorithms, programs, records of computation, and references. |
| Dale\'s_Pi_Page Includes history of Pi, songs and jokes, poems, news and the first 1,000,000 digits. |
| Earth_Mysteries___Notes_on_Pi An introduction to the number Pi and its history. |
| Elias\'_Pi_Page Includes Pi in the Binary number system, Pi as a sound file and Pi shown in different images. |
| Fun_With_Pi A Topica email list. Archives readable by anyone. |
| Harry_Smith\'s_Brief_History_of_Pi_Calculations Brief history of Pi calculations from the ancient times to present day. |
| History_and_Philosophy_of_Pi Probably no symbol of infinity in mathematics has evoked as much mystery, romanticism, misconception and human interest as the number and Greek letter of Pi. Interesting facts and trivia about Pi. |
| How_Pi? Extracting the digits of pi from the SlOka |
| How_Stuff_Works__Pi Animated graphic helps to explain Pi and the different ways of calculating Pi, with some related links. |
| Indiana_Pi_Bill Bill proposing new value of pi. |
| The_Joy_of_Pi Book, digits, links, facts, and quote. |
| Land_of_Pi Pi digits, random links, and some downloads. |
| Lucy_Scale_Developments Pitch, Pi, and other musical paradoxes. |
| The_Magic_Piworld Provides generated pictures and personal signs out of digits of Pi. Also a Picture Gallery, PiSign, PiPhonie. |
| A_New_Approach_to_the_Universal_Constant_\"pi\" A text that tries to prove that pi is 3.1416 exactly. |
| Paul\'s_Page_of_Pi Includes introduction on why people would want to calculate Pi, four methods for calculating it, over 8000 digits, poems and music. |
| Pi_3_1416 Mathematics as the language of nature. |
| Pi_Approximation_Day 22/7 - that is, July 22. For the past few years, people at Chalmers University have celebrated it. |
| Pi_Land Fun activities, a Pi trivia game and a Trainer for digit memorization. Pi poetry, artwork, and photography, calculations, digits and book reviews. |
| Pi_Memorama Includes a program that teaches Pi for the Mac, a page on why people learn to recite Pi and pages on how to memorise Pi. |
Search:
Home
About Us
Membership & Networks
Events
Publications
Awards
Press Office
You Are Here
Home
Technical Groups
Agriculture and Environment
BioResources
Colloid and Surface Chemistry
Construction Materials
Electrochemical Technology
Environment
Environmental Biotechnology
Fine Chemicals
Health and Safety
Horticulture
Oils and Fats
All Groups
Regional Groups
getName()}">America
getName()}">India
getName()}">Republic of Ireland
Bristol and South West
Cambridge and Great Eastern
London
Thames and Kennet
Yorkshire and the Humber
All Groups
Due to a technical problem with our main server, SCI's websites will be offline until further notice. We - and our supplier - are working hard to resolve the issue and we hope to be back online as soon as possible.
Contact us
Issue 21
10 November 2008
Published fortnightly, C&I magazine offers a vibrant mix of news, reviews, features and research highlights.
Chemistry & Industry
Recent Advances in Heterocycles
28/11/2008
Bio- pharmaceuticals
17/02/2009
Terms of Use
Privacy
Site Map
2008 SCI Founded in London 1881 and in New York 1894
Incorporated by Royal Charter 1907
Registered as UK Charity 206883
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src="http://www.soci.org//" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
var pageTracker = _gat._getTracker("UA-2599387-5");
pageTracker._initData();
pageTracker._trackPageview();
