A152213 Numbers n such that 7^n + 12 is prime.

0, 1, 2, 9, 66, 164, 221, 224, 2058, 3224, 12284, 13457, 22277, 22761, 83381

Offset: 1

Author

Huseyin Azoguz (huseyin(AT)mmnetz.de), Nov 29 2008

Keywords

• nonn
• more

Comments

a(16) > 10^5. - Robert Price, Jan 24 2014

Crossrefs

Cf. A236371, A217131, A191469, A090669, A096305, A217130, A217132, A152213.

Programs

Mathematica

Select[Range[0,84000],PrimeQ[7^#+12]&] (* Harvey P. Dale, Dec 03 2017 *)

PARI

is(n)=ispseudoprime(7^n+12) \\ Charles R Greathouse IV, Feb 17 2017

Extensions

a(11)-a(15) from Robert Price, Jan 24 2014