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Old 04 April 2014, 08:19 AM
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Richard W Richard W is offline
Join Date: 19 February 2000
Location: High Wycombe, UK
Posts: 26,441

Even ten years ago, 100 digits wasn't an unusually long prime. According to Wikipedia, primes of that length or more were known back in 1952. The current largest-known prime is 17,425,170 digits long!
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