295496100domain: NAppears in sequencesSquares whose sum of divisors is a square.at n=7A008848Duplicate of A008848.at n=7A074387Numbers n such that both sigma(n) and sigma(sigma(n)) are odd numbers.at n=13A097025Perfect (or pure) powers pp such that sigma(pp) is also a perfect (pure) power.at n=8A128607