Position of n-th 2 in A031324.

Terms

a(0) =2a(1) =8a(2) =19a(3) =35a(4) =57a(5) =70a(6) =73a(7) =93a(8) =94a(9) =98a(10) =106a(11) =109a(12) =118a(13) =126a(14) =131a(15) =132a(16) =144a(17) =145a(18) =163a(19) =171a(20) =187a(21) =193a(22) =234a(23) =238a(24) =249a(25) =260a(26) =265a(27) =269a(28) =273a(29) =275