cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-2 of 2 results.

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

Original entry on oeis.org

3, 7, 31, 4808643121, 483701705079089804581, 3283733939424401442167506310317720418331001
Offset: 1

Views

Author

Peter Luschny, Jul 21 2009

Keywords

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

Crossrefs

Cf. A056040, A103319, A163074-A163083.

Programs

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

A163082 Primes of the form p$ - 1 where p is prime, where '$' denotes the swinging factorial (A056040).

Original entry on oeis.org

5, 29, 139, 12011, 5651707681619, 386971244197199, 35257120210449712895193719, 815027488562171580969632861193966578650499
Offset: 1

Views

Author

Peter Luschny, Jul 21 2009

Keywords

Comments

The first values of p are 3, 5, 7, 13, 41 from A163080. Subsequence of A163076 (primes of the form k$ - 1).

Examples

			3 and 3$ - 1 = 5 are prime, so 5 is a member.

Links

Crossrefs

Cf. A056040, A163074-A163083.

Programs

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

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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