A102906 Primes of the form 3^k + 28.

29, 31, 37, 109, 271, 757, 59077, 4782997, 43046749, 847288609471, 717897987691852588770277, 58149737003040059690390197, 30903154382632612361920641803557, 1824800363140073127359051977856583949

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..23

Formula

a(n) = 3^A219046(n) + 28. - Elmo R. Oliveira, Nov 12 2023

Mathematica

Select[Table[3^n+28, {n, 0, 1000}], PrimeQ] (* Vincenzo Librandi, Jul 19 2012 *)

Prog

(Magma) [ a: n in [0..100] | IsPrime(a) where a is 3^n+28 ]; // Vincenzo Librandi, Jul 19 2012

Crossrefs

Cf. A000040, A219046 (corresponding k's).

Sequence in context: A050656 A050667 A288879 * A178456 A069453 A104071

Adjacent sequences: A102903 A102904 A102905 * A102907 A102908 A102909

Keyword

nonn

Author

Roger L. Bagula, Mar 01 2005

Extensions

a(1) added by Vincenzo Librandi, Jul 19 2012

Status

approved