Numbers k such that the odd part of (1+k) divides (1 + odd part of sigma(k)).

Terms

a(0) =1a(1) =3a(2) =7a(3) =15a(4) =31a(5) =63a(6) =127a(7) =255a(8) =511a(9) =1023a(10) =2047a(11) =2431a(12) =2943a(13) =3775a(14) =4095a(15) =8191a(16) =13311a(17) =14335a(18) =16383a(19) =17407a(20) =21951a(21) =22527a(22) =32767a(23) =34335a(24) =44031a(25) =57855a(26) =65535a(27) =85375a(28) =131071a(29) =204799