823592domain: NAppears in sequencesSums of 2 distinct powers of 7.at n=23A038481Sums of two powers of 7.at n=30A055258a(n) = n^7 + 7*n.at n=7A180357a(n) = 7^n + 7*n.at n=7A221909Expansion of phi_{7, 2}(x) where phi_{r, s}(x) = Sum_{n, m>0} m^r * n^s * x^{m*n}.at n=7A282751a(n) = Sum_{d|n} d^d * binomial(n/d,d).at n=48A376014