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A102906 Primes of the form 3^k + 28. 2
29, 31, 37, 109, 271, 757, 59077, 4782997, 43046749, 847288609471, 717897987691852588770277, 58149737003040059690390197, 30903154382632612361920641803557, 1824800363140073127359051977856583949 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
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
KEYWORD
nonn
AUTHOR
Roger L. Bagula, Mar 01 2005
EXTENSIONS
a(1) added by Vincenzo Librandi, Jul 19 2012
STATUS
approved

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Last modified July 24 09:20 EDT 2024. Contains 374575 sequences. (Running on oeis4.)