A305836 Numbers k such that (2^k-1)^4 + 2 is prime.

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

Offset: 1

Author

Patrick C. Schneider, Jun 11 2018

Keywords

• nonn
• more

Comments

a(16) > 10^5. - Robert Price, Jul 21 2018

Crossrefs

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

Programs

Mathematica

Select[Range@ 2000, PrimeQ[(2^# - 1)^4 + 2] &] (* Michael De Vlieger, Jun 11 2018 *)

PARI

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

Extensions

a(14) from Vaclav Kotesovec, Jun 16 2018

a(15) from Robert Price, Jun 20 2018