A243439 Primes of the form 3^k + 26.

29, 53, 107, 269, 2213, 19709, 177173, 43046747, 282429536507, 22876792454987, 239299329230617529590109, 19383245667680019896796749, 1144561273430837494885949696453, 969773729787523602876821942164080815560187

Offset: 1

Author

Vincenzo Librandi, Jun 05 2014

Keywords

• nonn

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..27

Crossrefs

Cf. A000040, A219044 (corresponding k's).

Cf. Similar sequences listed in A102903.

Programs

Magma

[a: n in [0..200] | IsPrime(a) where a is 3^n+26];

Mathematica

Select[Table[3^n + 26, {n, 0, 500}], PrimeQ]

Formula

a(n) = 3^A219044(n) + 26. - Elmo R. Oliveira, Nov 12 2023