625691domain: NAppears in sequencesa(n) = (1/C(0,0) + 1/C(2,1) + ... + 1/C(2n,n))*L, where L = LCM{C(0,0), C(2,1),..., C(2n,n)}.at n=7A025541Numbers k that divide 8^k + 3^k.at n=9A045587