A195439 Numbers n such that 16^n + 1 is a semiprime.

3, 5, 7, 8, 10, 16, 23, 26, 32, 37, 64, 89, 149, 173, 251, 307, 317, 956, 30197, 46058

Offset

1,1

Links

Table of n, a(n) for n=1..20.

Mathematica

Select[Range[37], PrimeOmega[16^# + 1] == 2 &] (* Arkadiusz Wesolowski, Dec 15 2011 *)

Crossrefs

Cf. A002590, A057182, A127317.

Sequence in context: A227130 A258025 A239419 * A338446 A190719 A187224

Adjacent sequences: A195436 A195437 A195438 * A195440 A195441 A195442

Keyword

nonn

Author

Arkadiusz Wesolowski, Oct 19 2011

Status

approved