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A258944
Odd primes p that divide 2! + 3! + ... + (p-1)!.
1
31, 373, 6855730873
OFFSET
1,1
COMMENTS
In other words, the odd primes p that divide A003422(p) - 2. Or the primes p with A049782(p) = 2.
Andrejic and Tatarevic found a(3).
LINKS
Vladica Andrejic and Milos Tatarevic, Searching for a counterexample of Kurepa's Conjecture, arXiv:1409.0800 [math.NT], 2014.
PROG
(PARI) forprime(p=3, 1e11, if(sum(k=2, p-1, k!) % p==0, print1(p, ", "))); \\ Altug Alkan, Nov 08 2015
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Jeppe Stig Nielsen, Nov 07 2015
STATUS
approved