Position of n-th 2 in A031269.

Terms

a(0) =2a(1) =8a(2) =15a(3) =19a(4) =32a(5) =35a(6) =38a(7) =40a(8) =41a(9) =42a(10) =43a(11) =46a(12) =55a(13) =58a(14) =65a(15) =66a(16) =67a(17) =75a(18) =83a(19) =84a(20) =99a(21) =106a(22) =107a(23) =108a(24) =118a(25) =119a(26) =120a(27) =124a(28) =126a(29) =131