456992domain: NAppears in sequencesa(n) = Sum_{d|n, n/d=1 mod 4} d^4.at n=25A050463a(n) = Sum_{d|n, n/d=1 mod 4} d^4 - Sum_{d|n, n/d=3 mod 4} d^4.at n=25A050468a(0) = 0, a(n) = Sum_{0<d|n, n/d odd} d^4 for n > 0.at n=26A285989Sum of the 4th powers of the divisor complements of the odd proper divisors of n.at n=25A352050