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

Author

Peter Luschny, Jul 21 2009

Keywords

• nonn

Comments

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

Examples

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

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.

Crossrefs

Cf. A056040, A103319, A163074-A163083.

Programs

Maple

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