Numbers k such that k / (A000005(k)*(A000005(k)+1)/2) is an integer.

Terms

a(0) =1a(1) =3a(2) =10a(3) =63a(4) =147a(5) =156a(6) =225a(7) =234a(8) =408a(9) =600a(10) =680a(11) =684a(12) =952a(13) =1014a(14) =1496a(15) =1500a(16) =1768a(17) =2176a(18) =2584a(19) =3128a(20) =3944a(21) =4216a(22) =4224a(23) =4275a(24) =5032a(25) =5576a(26) =5848a(27) =5880a(28) =6392a(29) =6498