A123374 Primes p such that p^2 divides A086787(p+1).

2, 5, 17, 151

Offset: 1

Author

Alexander Adamchuk, Oct 13 2006

Keywords

• hard
• more
• nonn

Comments

p divides A086787(p+1) for all prime p, except p=3.

Primes p such that p^2 divides (3 + Sum_{j=1..p+1} B_j) * p + 1, where B_j is the j-th Bernoulli number. [Max Alekseyev, Feb 19 2011]

Next term, if it exists, exceeds 320000. [Max Alekseyev, Mar 13 2011]

Examples

			a(1) = 2 because 2^2 divides A086787(3) = 56.
a(2) = 5 because 5^2 divides A086787(6) = 82200, but 3^2 does not divide A086787(4) = 494.
		

Crossrefs

Cf. A086787.