The 4-cycle of the n => sigma(n)-n process. sigma(n) is the sum of divisors of n. (A000203).

A072892

The 4-cycle of the n => sigma(n)-n process. sigma(n) is the sum of divisors of n. (A000203).

Terms

    a(0) =1264460a(1) =1547860a(2) =1727636a(3) =1305184a(4) =1264460

External references