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A163075 Primes of the form k$ + 1. Here '$' denotes the swinging factorial function (A056040). 5
2, 3, 7, 31, 71, 631, 3433, 51481, 2704157, 280816201, 4808643121, 35345263801, 2104098963721, 94684453367401, 1580132580471901, 483701705079089804581, 6892620648693261354601, 410795449442059149332177041, 2522283613639104833370312431401 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Peter Luschny, Swinging Primes.
EXAMPLE
Since 3$ = 4$ = 6 the prime 7 is listed, however only once.
MAPLE
a := proc(n) select(isprime, map(x -> A056040(x)+1, [$1..n])) end:
MATHEMATICA
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 *)
CROSSREFS
Cf. A056040, A088332, A163077 (arguments k), A163074, A163076.
Sequence in context: A008840 A268477 A156313 * A265113 A228171 A089359
KEYWORD
nonn
AUTHOR
_Peter Luschny_, Jul 21 2009
EXTENSIONS
More terms from _Jinyuan Wang_, Mar 22 2020
STATUS
approved

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Last modified March 1 13:16 EST 2024. Contains 370433 sequences. (Running on oeis4.)