[seqfan] Primes of the form (4^p+1)/5^t

Vladimir Shevelev shevelev at bgu.ac.il
Tue Mar 14 19:50:57 CET 2017

Dear Seq Fans,

Let N=(4^p+1)/5^t, where p
is prime, 5^t is the most power of 5
dividing 4^p+1. For  p=2, 3, 5, N=
17,13,41. What is the next prime p
for which N is prime?

Best regards,

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