File:MersennePrimeStamp.gif

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MersennePrimeStamp.gif ‎(287 × 94 pixels, file size: 14 KB, MIME type: image/gif)

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Summary

DescriptionMersennePrimeStamp.gif	English: This image is courtesy of Chris Caldwell. Donald B. Gillies discovered 3 new mersenne primes in early 1963. When the primes were confirmed the UIUC Math dept (which has a postal branch) used this cancellation stamp on all mail from roughly 1964 - 1976, when Appel and Haken proved the four color theorem ("Four Colors Suffice") and a new stamp was created. Trivia question : how far away from Gillies did Appel live in Urbana Illinois ?? Answer : He lived 3 houses away.
Date	1963
Source	Transferred from en.wikipedia to Commons.
Author	Math Department at UIUC
Permission (Reusing this file)	Licensed by uploader as GFDL, but it appears to be ineligible for copyright

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Original upload log

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2005-06-27 05:00 SystemBuilder 287×94× (13894 bytes) Donald B. Gillies discovered 3 new mersenne primes in early 1963. When the primes were confirmed the UIUC Math dept (which has a postal branch) used this cancellation stamp on all mail from roughly 1964 - 1976, when Appel and Haken proved the 4-color the

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	Date/Time	Dimensions	User	Comment
current	00:40, 1 October 2010	287 × 94 (14 KB)	KurtSchwitters	{{Information \|Description={{en\|1=Math Department at UIUC created this postal meter cancellation stamp to celebrate a new Mersenne prime}} \|Source=Internet \|Author=Math Department at UIUC \|Date=1963 \|Permission= \|other_versions= }}

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Largest known prime number