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A104065 Primes of the form 7^k + 4. 8
5, 11, 53, 347, 16811, 823547, 40353611, 678223072853, 27368747340080916347 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..9.

MATHEMATICA

a = Delete[Union[Flatten[Table[If [PrimeQ[7^n + 3 + 1] == True, 7^n + 3 + 1, 0], {n, 1, 400}]]], 1]

Select[7^Range[0, 30]+4, PrimeQ] (* Harvey P. Dale, Jul 31 2021 *)

CROSSREFS

Sequence in context: A149527 A201180 A109546 * A212304 A018545 A028349

Adjacent sequences:  A104062 A104063 A104064 * A104066 A104067 A104068

KEYWORD

nonn

AUTHOR

Roger L. Bagula, Mar 02 2005

EXTENSIONS

Initial 5 from Vincenzo Librandi, Dec 10 2010

STATUS

approved

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Last modified May 25 17:48 EDT 2022. Contains 354071 sequences. (Running on oeis4.)