View Single Post
  #4  
Old 04 April 2014, 09:19 AM
Richard W's Avatar
Richard W Richard W is offline
 
Join Date: 19 February 2000
Location: High Wycombe, UK
Posts: 26,357
Default

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!

http://en.wikipedia.org/wiki/Largest_known_prime_number
Reply With Quote