Position of n-th 2 in A031298.

Terms

a(0) =2a(1) =14a(2) =31a(3) =33a(4) =34a(5) =35a(6) =37a(7) =39a(8) =41a(9) =43a(10) =45a(11) =47a(12) =49a(13) =54a(14) =74a(15) =94a(16) =114a(17) =134a(18) =154a(19) =174a(20) =196a(21) =226a(22) =251a(23) =254a(24) =256a(25) =257a(26) =260a(27) =263a(28) =266a(29) =269