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A289851 Primes of the form k!2-8, where k!2 is the double factorial number (A006882). 1
7, 97, 937, 654729067, 13113070457687988603440617, 563862029680583509947946867, 536347102817482913555411512425352545980058003572241486357421867, 352999527454840466971061863960307904899505075341088595453568994140617 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Henri & Renaud Lifchitz, PRP Records.Search for n!2-8.
OpenPFGW Project, Primality Tester
MATHEMATICA
MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
Select[Table[MultiFactorial[i, 2] - 8, {i, 5, 100}], PrimeQ[#]&]
Select[Range[5, 100]!!-8, PrimeQ] (* Harvey P. Dale, Feb 06 2024 *)
CROSSREFS
Cf. A259359.
Sequence in context: A116288 A219088 A116261 * A362472 A242377 A178005
KEYWORD
nonn
AUTHOR
Robert Price, Jul 13 2017
EXTENSIONS
Definition corrected by Harvey P. Dale, Feb 06 2024
STATUS
approved

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Last modified June 22 14:17 EDT 2024. Contains 373587 sequences. (Running on oeis4.)