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A289851
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Primes of the form k!2-8, where k!2 is the double factorial number (A006852).
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1
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7, 97, 937, 654729067, 13113070457687988603440617, 563862029680583509947946867, 536347102817482913555411512425352545980058003572241486357421867, 352999527454840466971061863960307904899505075341088595453568994140617
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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Robert Price, Table of n, a(n) for n = 1..10
Henri & Renaud Lifchitz, PRP Records.Search for n!2-8.
Joe McLean, Interesting Sources of Probable Primes
OpenPFGW Project, Primality Tester
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MATHEMATICA
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MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
Select[Table[MultiFactorial[i, 2] - 8, {i, 5, 100}], PrimeQ[#]&]
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CROSSREFS
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Cf. A259359.
Sequence in context: A116288 A219088 A116261 * A242377 A178005 A268706
Adjacent sequences: A289848 A289849 A289850 * A289852 A289853 A289854
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KEYWORD
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nonn
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AUTHOR
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Robert Price, Jul 13 2017
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STATUS
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approved
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