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

Author

Arkadiusz Wesolowski, Oct 19 2011

Keywords

• nonn

Crossrefs

Cf. A002590, A057182, A127317.

Programs

Mathematica

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