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A309409 Numbers k such that (37^k + 1)/38 is prime. 0

%I #9 Jul 31 2019 09:05:38

%S 5,7,2707,163193

%N Numbers k such that (37^k + 1)/38 is prime.

%C Larger terms correspond to probable primes.

%H P. Bourdelais, <a href="https://listserv.nodak.edu/cgi-bin/wa.exe?A2=NMBRTHRY;417ab0d6.0906">A Generalized Repunit Conjecture</a>

%t Do[p=Prime[n]; If[PrimeQ[(37^p + 1)/38], Print[p]], {n, 1, 1000000}]

%o (PARI) is(n)=ispseudoprime((37^n+1)/38)

%K nonn,hard,more

%O 1,1

%A _Paul Bourdelais_, Jul 29 2019

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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)