Numbers k such that Sum_{j=1..k} j^phi(j) == 0 (mod k).

Terms

a(0) =1a(1) =3a(2) =4a(3) =12a(4) =21a(5) =39a(6) =91a(7) =156a(8) =381a(9) =1668a(10) =3292a(11) =4541a(12) =6515a(13) =12927a(14) =49492a(15) =72412a(16) =100595a(17) =158708