login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A163081 Primes of the form p$ + 1 where p is prime, where '$' denotes the swinging factorial (A056040). 1
3, 7, 31, 4808643121, 483701705079089804581, 3283733939424401442167506310317720418331001 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
The values of p are 2, 3, 5, 31, 67, 139 which is A163079. Subsequence of A163075 (primes of the form k$ + 1).
LINKS
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
Sequence in context: A263049 A167917 A249761 * A332386 A096239 A074699
KEYWORD
nonn
AUTHOR
Peter Luschny, Jul 21 2009
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 23 00:50 EST 2024. Contains 370265 sequences. (Running on oeis4.)