A243438 Primes of the form 3^k + 22.

23, 31, 103, 751, 4782991, 282429536503, 50031545098999729, 49269609804781974438694403402127765889

Offset: 1

Author

Vincenzo Librandi, Jun 05 2014

Keywords

• nonn

Comments

Associated k: 0, 2, 4, 6, 14, 24, 35, 79, 178, 186, 230, ...

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..18

Crossrefs

Cf. A000040, A219042 (corresponding k's).

Cf. Similar sequences listed in A102903.

Programs

Magma

[a: n in [0..200] | IsPrime(a) where a is 3^n+22];

Mathematica

Select[Table[3^n + 22, {n, 0, 500}], PrimeQ]

Formula

a(n) = 3^A219042(n) + 22. - Elmo R. Oliveira, Nov 12 2023