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

1,3

Comments

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

Links

Table of n, a(n) for n=1..15.

Mathematica

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

Prog

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

Crossrefs

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

Sequence in context: A100195 A032396 A271884 * A233349 A233556 A087148

Adjacent sequences: A305833 A305834 A305835 * A305837 A305838 A305839

Keyword

nonn,more

Author

Patrick C. Schneider, Jun 11 2018

Extensions

a(14) from Vaclav Kotesovec, Jun 16 2018

a(15) from Robert Price, Jun 20 2018

Status

approved