Positions of ones in A264977; positions of twos in A277330.

Terms

a(0) =1a(1) =5a(2) =13a(3) =29a(4) =41a(5) =61a(6) =85a(7) =125a(8) =173a(9) =209a(10) =253a(11) =281a(12) =313a(13) =349a(14) =421a(15) =509a(16) =565a(17) =629a(18) =701a(19) =845a(20) =929a(21) =1021a(22) =1133a(23) =1261a(24) =1405a(25) =1693a(26) =1861a(27) =2045a(28) =2269a(29) =2525