446600domain: NAppears in sequencesa(n) = 31250*n - 22150.at n=14A157619Number of solutions to x^2 + y^2 + z^2 + t^2 == n (mod 2*n) for x,y,z,t in [0, 2*n).at n=34A229294Numbers k, not powers of primes, for which A011772(k) divides A344875(k), and for all proper divisors d of k, A011772(d) < A011772(k).at n=34A344694