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 A329177 Numbers k such that k![4] - 256 is prime, where k![4] = A007662(k) = quadruple factorial. 0
 15, 17, 19, 21, 23, 25, 33, 39, 41, 43, 53, 63, 67, 73, 157, 167, 181, 195, 221, 327, 363, 419, 849, 861, 1233, 1265, 1599, 2413, 2515, 4009, 8291, 8475, 10685, 13957, 17453, 18409, 19117, 22739, 33313, 37861, 59703, 64983, 80697 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(44) > 10^5. The first 5 primes associated with this sequence are: 3209, 9689, 65579, 208589, 1513949. LINKS C. K. Caldwell, The Prime Glossary, multifactorial prime C. Caldwell and H. Dubner (Eds): The top ten prime numbers: from the unpublished collections of R. Ondrejka (May 2001), Table 21 F, p. 75.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. Joe McLean, Interesting Sources of Probable Primes MATHEMATICA MultiFactorial[n_, k_] := If[n < 1, 1, n*MultiFactorial[n - k, k]]; Select[Range[1000], (x = MultiFactorial[#, 4] - 256; x > 0 && PrimeQ[x]) &] CROSSREFS Cf. A007662, A283553. Sequence in context: A077033 A043669 A043704 * A074748 A183981 A155111 Adjacent sequences:  A329174 A329175 A329176 * A329178 A329179 A329180 KEYWORD nonn AUTHOR Robert Price, Nov 07 2019 STATUS approved

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Last modified September 28 05:33 EDT 2020. Contains 337392 sequences. (Running on oeis4.)