|
|
A123374
|
|
Primes p such that p^2 divides A086787(p+1).
|
|
1
|
|
|
|
OFFSET
|
1,1
|
|
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]
|
|
LINKS
|
|
|
EXAMPLE
|
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
|
|
|
KEYWORD
|
hard,more,nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|