Positions of check bits in code in A075931.

Terms

a(0) =15a(1) =51a(2) =85a(3) =106a(4) =150a(5) =171a(6) =219a(7) =237a(8) =247a(9) =279a(10) =297a(11) =455a(12) =537a(13) =557a(14) =594a(15) =643a(16) =803a(17) =863a(18) =998a(19) =1051a(20) =1070a(21) =1112a(22) =1169a(23) =1333a(24) =1345a(25) =1620a(26) =1866a(27) =2076a(28) =2085a(29) =2185