A230433 Numbers k such that 43^k + 4 is prime.

1, 7, 13, 17, 33, 43, 205, 287, 669, 1161, 1166, 3753, 6095, 18123, 28041

Offset

1,2

Comments

a(16) > 5*10^4.

Links

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

Mathematica

Do[If[PrimeQ[43^k + 4], Print[k]], {k, 50000}]

Crossrefs

Cf. A058958.

Sequence in context: A138337 A359063 A174877 * A029477 A019378 A250288

Adjacent sequences: A230430 A230431 A230432 * A230434 A230435 A230436

Keyword

nonn,more

Author

Robert Price, Oct 18 2013

Status

approved