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A302090 Numbers k such that 6*k^k + 5 is prime. 3

%I #20 Feb 16 2020 20:12:03

%S 0,1,2,3,6,7,134,533,2911,4351

%N Numbers k such that 6*k^k + 5 is prime.

%C a(11) > 50000. - _Robert Price_, Feb 16 2020

%o (PARI) for(n=0, 500, if(isprime(6*n^n+5), print1(n", ")))

%Y Numbers k such that b*k^k + b - 1 is prime: A110932 (b=2), A160360 (b=3), A301520 (b=4), A302088 (b=5), this sequence (b=6).

%Y Cf. A302091.

%K nonn,more,hard

%O 1,3

%A _Seiichi Manyama_, Apr 01 2018

%E a(8) from _Jon E. Schoenfield_, Apr 01 2018

%E a(9)-a(10) from _Vaclav Kotesovec_, Apr 01 2018

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Last modified June 16 07:19 EDT 2024. Contains 373423 sequences. (Running on oeis4.)