OFFSET
4,1
COMMENTS
a(n) is integer for all n>=4, see A268512.
LINKS
R. R. Aidagulov, M. A. Alekseyev. On p-adic approximation of sums of binomial coefficients. Journal of Mathematical Sciences 233:5 (2018), 626-634. doi:10.1007/s10958-018-3948-0 arXiv:1602.02632
PROG
(PARI) { A268589(n) = my(p=prime(n)); (12 - 9*binomial(2*p, p) + 2*binomial(3*p, p))/p^5; }
CROSSREFS
KEYWORD
nonn
AUTHOR
Max Alekseyev, Feb 07 2016
STATUS
approved