Numbers k such that k*Sum_{d|k} 1/sigma(d) is an integer.

Terms

a(0) =1a(1) =6a(2) =14a(3) =40a(4) =120a(5) =244a(6) =280a(7) =440a(8) =494a(9) =680a(10) =920a(11) =1220a(12) =2040a(13) =2840a(14) =2968a(15) =3480a(16) =6360a(17) =9880a(18) =10680a(19) =16376a(20) =20618a(21) =25160a(22) =32280a(23) =34720a(24) =40136a(25) =40280a(26) =42136a(27) =45560a(28) =45994a(29) =46280