Thread: Primes found!
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Old 2015-01-17, 04:16   #10
Batalov
 
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"Serge"
Mar 2008
Phi(4,2^7658614+1)/2

225438 Posts
Thumbs up a NeRDs-related twin pair

A small but elegant twin pair (using one "7" and two "7"s, with the rest of digits being "9"s):
10^4621-2*10^4208-1 is prime
10^4621-2*10^4208-3 is prime (Prime certificate is available)
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