Numbers k such that 2^m == 2 (mod m*(m+1)), where m = A019320(k).

Terms

a(0) =1a(1) =4a(2) =9a(3) =12a(4) =25a(5) =36a(6) =40a(7) =52a(8) =80a(9) =92a(10) =124a(11) =150a(12) =208a(13) =306a(14) =361a(15) =630a(16) =656a(17) =1648a(18) =1780a(19) =2508a(20) =3300a(21) =3540a(22) =5728a(23) =6260a(24) =6450a(25) =7500a(26) =10820a(27) =12656a(28) =14076a(29) =14132