Numbers m = concat(s,t) such that m = (sigma(s)-s) * (sigma(t)-t), where sigma(x)-x is the sum of the aliquot parts of x.

A253825

Numbers m = concat(s,t) such that m = (sigma(s)-s) * (sigma(t)-t), where sigma(x)-x is the sum of the aliquot parts of x.

Terms

    a(0) =6396a(1) =20680a(2) =124416a(3) =567816a(4) =1719480a(5) =7593432a(6) =10538040a(7) =36382320a(8) =107277800a(9) =123251968a(10) =166601760a(11) =327844840a(12) =933363000a(13) =1286859804a(14) =2524125184a(15) =3398418000a(16) =4561432920a(17) =4566915540a(18) =4911440776a(19) =7097433536a(20) =16913792670a(21) =20565608940a(22) =21099997800a(23) =27639552000

External references