login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

Numbers k such that (2^k-1)^4 + 2 is prime.
0

%I #33 Jul 21 2021 00:43:25

%S 0,1,2,4,6,10,12,30,78,244,490,760,1808,4790,34330

%N Numbers k such that (2^k-1)^4 + 2 is prime.

%C a(16) > 10^5. - _Robert Price_, Jul 21 2018

%t Select[Range@ 2000, PrimeQ[(2^# - 1)^4 + 2] &] (* _Michael De Vlieger_, Jun 11 2018 *)

%o (PARI) is(n)=ispseudoprime((2^n-1)^4+2)

%Y Cf. A128832 ((2^n-1)^4).

%K nonn,more

%O 1,3

%A _Patrick C. Schneider_, Jun 11 2018

%E a(14) from _Vaclav Kotesovec_, Jun 16 2018

%E a(15) from _Robert Price_, Jun 20 2018