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A301521 Numbers k such that 4*k^k - 3 is prime. 8

%I

%S 2,4,5,7,22,1045

%N Numbers k such that 4*k^k - 3 is prime.

%C Next term, if it exists, is greater than 5000. - _Vaclav Kotesovec_, Mar 25 2018

%C Next term, if it exists, is greater than 25000. - _Robert Price_, Apr 22 2019

%t Select[Range[1000], PrimeQ[4*#^# - 3] &] (* _Vaclav Kotesovec_, Mar 25 2018 *)

%o (PARI) for(n=0, 100, if(isprime(4*n^n-3), print1(n", ")))

%Y Cf. A301520, A301870.

%K nonn,hard,more

%O 1,1

%A _Seiichi Manyama_, Mar 23 2018

%E a(6) from _Vaclav Kotesovec_, Mar 25 2018

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Last modified November 13 00:25 EST 2019. Contains 329083 sequences. (Running on oeis4.)