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A288411
Primes of the form k!2+256, where k!2 is the double factorial number (A006852).
1
257, 271, 1201, 10651, 135391, 316234143481, 49988475139107080748861383849035044804037186461213252284425520655249250725695020643146597883951938106998443603515881
OFFSET
1,1
COMMENTS
The next term has 174 digits. - Harvey P. Dale, Mar 09 2018
LINKS
MATHEMATICA
MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
Select[Table[MultiFactorial[i, 2] + 256, {i, 0, 100}], PrimeQ[#]&]
Select[Range[200]!!+256, PrimeQ] (* Harvey P. Dale, Mar 09 2018 *)
CROSSREFS
Cf. A076195.
Sequence in context: A253149 A139653 A273551 * A060879 A062382 A289560
KEYWORD
nonn
AUTHOR
Robert Price, Jun 08 2017
STATUS
approved