Position of n-th 2 in A031045.

Terms

a(0) =2a(1) =12a(2) =25a(3) =27a(4) =28a(5) =29a(6) =31a(7) =33a(8) =35a(9) =37a(10) =39a(11) =44a(12) =60a(13) =76a(14) =92a(15) =108a(16) =126a(17) =150a(18) =169a(19) =172a(20) =174a(21) =175a(22) =178a(23) =181a(24) =184a(25) =187a(26) =190a(27) =198a(28) =222a(29) =246