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A283594 Numbers k such that k![12]+2 is prime, where k![12] is the twelvefold multi-factorial. 1
0, 1, 3, 5, 9, 11, 15, 21, 27, 29, 39, 99, 159, 213, 249, 351, 443, 489, 513, 563, 705, 1059, 1599, 1733, 2361, 3699, 4263, 4451, 4479, 5141, 5751, 7355, 7461, 8525, 8861, 18231, 19629, 23571, 41789, 76973, 86997, 93735, 98943 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

a(44) > 10^5.

The first 12 primes associated with this sequence: 3, 3, 5, 7, 11, 13, 47, 191, 1217, 2467, 47387.

LINKS

Table of n, a(n) for n=1..43.

C. Caldwell and H. Dubner (Eds): The top ten prime numbers: from the unpublished collections of R. Ondrejka (May 2001), Table 21 F, p. 75

Ken Davis, Status of Search for Multifactorial Primes.

MATHEMATICA

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

Select[Range[0, 50000], PrimeQ[MultiFactorial[#, 12] + 2] &]

CROSSREFS

Cf. A076185, A085158, A094144, A204657.

Sequence in context: A210537 A199407 A261141 * A233764 A233780 A233970

Adjacent sequences:  A283591 A283592 A283593 * A283595 A283596 A283597

KEYWORD

nonn

AUTHOR

Robert Price, Mar 11 2017

EXTENSIONS

a(40)-a(43) from Robert Price, Mar 24 2017

STATUS

approved

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Last modified April 20 17:54 EDT 2019. Contains 322310 sequences. (Running on oeis4.)