Numbers k such that Sum_{i=1..k} sigma(i)^d(i) == 0 (mod k), where sigma = A000203 and d = A000005.
A260654
Numbers k such that Sum_{i=1..k} sigma(i)^d(i) == 0 (mod k), where sigma = A000203 and d = A000005.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =56a(4) =59a(5) =60a(6) =75a(7) =122a(8) =743a(9) =2835a(10) =3951a(11) =5712a(12) =6866a(13) =7884a(14) =14754a(15) =18751a(16) =292123a(17) =465289a(18) =1921892a(19) =3902477a(20) =7609760a(21) =21855984a(22) =22013406a(23) =358753359a(24) =570535294a(25) =582046711a(26) =1846338478a(27) =13691385818
External references
- oeis: A260654