Semiprimes whose prime factors differ from each other in one bit position only.

Terms

a(0) =6a(1) =21a(2) =33a(3) =35a(4) =57a(5) =65a(6) =161a(7) =185a(8) =201a(9) =323a(10) =377a(11) =393a(12) =437a(13) =473a(14) =497a(15) =713a(16) =899a(17) =1529a(18) =1577a(19) =1763a(20) =1769a(21) =1841a(22) =1961a(23) =2021a(24) =2537a(25) =3233a(26) =3473a(27) =3497a(28) =3737a(29) =4553