17249876310domain: NAppears in sequencesa(n) = sigma_7(2n-1).at n=14A081865a(n) = Sum_{d|n} (-1)^(d-1)*d^7.at n=28A321546a(n) = Sum_{d|n} (-1)^(n/d+1)*d^7.at n=28A321552Sum of 7th powers of odd divisors of n.at n=28A321811Sum of the 7th powers of the squarefree divisors of n.at n=28A351270