A 4-cycle of the k => sigma(k)-k process, where sigma(k) is the sum of divisors of k (A000203).

A073033

A 4-cycle of the k => sigma(k)-k process, where sigma(k) is the sum of divisors of k (A000203).

Terms

    a(0) =18656380a(1) =20522060a(2) =28630036a(3) =24289964a(4) =18656380a(5) =20522060a(6) =28630036a(7) =24289964a(8) =18656380a(9) =20522060a(10) =28630036a(11) =24289964a(12) =18656380a(13) =20522060a(14) =28630036a(15) =24289964a(16) =18656380a(17) =20522060a(18) =28630036a(19) =24289964a(20) =18656380a(21) =20522060a(22) =28630036a(23) =24289964

External references