A177502 Prime numbers p such that (p-2)! + 1 is prime.

2, 3, 5, 13, 29, 43, 79, 401, 26953

Offset

1,1

Links

Table of n, a(n) for n=1..9.

Titus Piezas III et al., Solving Solvable Sextics Using Polynomial Decomposition, 2004.

Example

a(1)=2 because (2-2)! + 1 = 0! + 1 = 1 + 1 = 2.

Mathematica

aa = {}; Do[p = Prime[n]; If[PrimeQ[(p - 2)! + 1], AppendTo[aa, p]], {n, 1, 10000}]; aa (* Artur Jasinski, May 19 2010 *)

Crossrefs

Cf. A088054, A002981.

Sequence in context: A173718 A281316 A329241 * A072536 A087592 A248526

Adjacent sequences: A177499 A177500 A177501 * A177503 A177504 A177505

Keyword

nonn,more

Author

Artur Jasinski, May 10 2010

Extensions

New term added by Artur Jasinski, May 19 2010

Status

approved