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A057189 Numbers n such that (23^n+1)/24 is a prime. 14

%I #12 Oct 30 2017 04:31:55

%S 11,13,67,109,331,587,24071,29881,44053

%N Numbers n such that (23^n+1)/24 is a prime.

%C Some of the larger terms may only correspond to probable primes.

%C a(10) > 10^5. - _Robert Price_, Jun 04 2013

%H H. Dubner and T. Granlund, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL3/DUBNER/dubner.html">Primes of the Form (b^n+1)/(b+1)</a>, J. Integer Sequences, 3 (2000), #P00.2.7.

%o (PARI) isok(n) = (denominator(p=(23^n+1)/24)==1) && isprime(p); \\ _Michel Marcus_, Oct 30 2017

%K nonn,more

%O 1,1

%A _N. J. A. Sloane_, Sep 15 2000

%E a(7)-a(9) from _Robert Price_, Jun 04 2013

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Last modified March 29 00:26 EDT 2024. Contains 371264 sequences. (Running on oeis4.)