Numbers k such that Sum_{j=1..k} antisigma(j) == 0 (mod sigma(k)).

Terms

a(0) =1a(1) =2a(2) =39a(3) =78a(4) =100a(5) =126a(6) =434a(7) =501a(8) =1313a(9) =54111a(10) =359466a(11) =523219a(12) =6601441a(13) =8034674a(14) =54092207a(15) =64149290a(16) =158882288a(17) =3016740661a(18) =20951813922a(19) =52815759197a(20) =120508871819