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Image: MersennePrimeStamp

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

Description: 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.
Title: MersennePrimeStamp
Credit: Transferred from en.wikipedia to Commons.
Author: Math Department at UIUC
Permission: Licensed by uploader as GFDL, but it appears to be ineligible for copyright
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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