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A288376 Primes of the form k!2+2, where k!2 is the double factorial number (A006852). 1
3, 5, 17, 107, 947, 13749310577, 316234143227, 213458046676877, 495179769008019818390136611716089140627, 13114900840751548972796135496384318234575359262373046877, 28352254429826839019508359891905756542124154226667992913078222750278633810791015627 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Robert Price, Table of n, a(n) for n = 1..12

Henri& Renaud Lifchitz, PRP Records.Search for n!2+2.

Joe McLean, Interesting Sources of Probable Primes

OpenPFGW Project, Primality Tester

MATHEMATICA

MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];

Select[Table[MultiFactorial[i, 2] + 2, {i, 0, 100}], PrimeQ[#]&]

CROSSREFS

Cf. A076815.

Sequence in context: A087858 A191222 A084723 * A096178 A107312 A083213

Adjacent sequences:  A288373 A288374 A288375 * A288377 A288378 A288379

KEYWORD

nonn

AUTHOR

Robert Price, Jun 08 2017

STATUS

approved

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Last modified December 1 16:29 EST 2021. Contains 349430 sequences. (Running on oeis4.)