OFFSET
1,1
COMMENTS
Does this contain 2 and the entries of A129518? - R. J. Mathar, Aug 07 2015
Primes p such that (p-1)!! == -1 (mod p). - Thomas Ordowski, Jul 26 2016
LINKS
Matthew Campbell and Charles R Greathouse IV, Table of n, a(n) for n = 1..10000 (first 2516 terms from Campbell)
FORMULA
a(n) = prime(A260299(n)).
MATHEMATICA
fQ[n_] := Mod[Hyperfactorial[n - 1], n] == 1; Select[ Prime@ Range@ 210, fQ] (* Robert G. Wilson v, Aug 06 2015 *)
PROG
(PARI) is(p)=prod(k=2, p-1, Mod(k, p)^k)==1 && isprime(p) \\ Charles R Greathouse IV, Aug 05 2015
CROSSREFS
KEYWORD
nonn
AUTHOR
Matthew Campbell, Jul 22 2015
STATUS
approved