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A163075
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Primes of the form k$ + 1. Here '$' denotes the swinging factorial function (A056040).
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5
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2, 3, 7, 31, 71, 631, 3433, 51481, 2704157, 280816201, 4808643121, 35345263801, 2104098963721, 94684453367401, 1580132580471901, 483701705079089804581, 6892620648693261354601, 410795449442059149332177041, 2522283613639104833370312431401
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OFFSET
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1,1
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LINKS
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EXAMPLE
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Since 3$ = 4$ = 6 the prime 7 is listed, however only once.
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MAPLE
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a := proc(n) select(isprime, map(x -> A056040(x)+1, [$1..n])) end:
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MATHEMATICA
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Reap[Do[f = n!/Quotient[n, 2]!^2; If[PrimeQ[p = f + 1], Sow[p]], {n, 1, 70}]][[2, 1]] // Union (* Jean-François Alcover, Jun 28 2013 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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