OFFSET
2,2
COMMENTS
a(n) is always an integer.
Primes p such that p^2 divides A006134((p-1)/2) - Legendre(p, 3) are p = 103, ... What's the next?
FORMULA
a(2) = (binomial(0, 0) + binomial(2, 1))/3 = 3/3 = 1.
a(3) = (binomial(0, 0) + binomial(2, 1) + binomial(4, 2) + 1)/5 = 10/5 = 2.
a(4) = (binomial(0, 0) + binomial(2, 1) + binomial(4, 2) + binomial(6, 3) - 1)/7 = 28/7 = 4.
PROG
CROSSREFS
KEYWORD
nonn
AUTHOR
Jianing Song, Oct 18 2018
STATUS
approved