A163081 Primes of the form p$ + 1 where p is prime, where '$' denotes the swinging factorial (A056040).

3, 7, 31, 4808643121, 483701705079089804581, 3283733939424401442167506310317720418331001

Offset

1,1

Comments

The values of p are 2, 3, 5, 31, 67, 139 which is A163079. Subsequence of A163075 (primes of the form k$ + 1).

Links

Jinyuan Wang, Table of n, a(n) for n = 1..7

Peter Luschny, Die schwingende Fakultät und Orbitalsysteme, August 2011.

Peter Luschny, Swinging Primes.

Example

3 and 3$ + 1 = 7 are prime, so 7 is a member.

Maple

a := proc(n) select(isprime, [$2..n]); select(isprime, map(x -> A056040(x)+1, %)) end:

Crossrefs

Cf. A056040, A103319, A163074-A163083.

Sequence in context: A263049 A167917 A249761 * A332386 A096239 A074699

Adjacent sequences: A163078 A163079 A163080 * A163082 A163083 A163084

Keyword

nonn

Author

Peter Luschny, Jul 21 2009

Status

approved