Position of n-th 2 in A031035.

Terms

a(0) =2a(1) =13a(2) =24a(3) =26a(4) =28a(5) =29a(6) =30a(7) =32a(8) =34a(9) =36a(10) =38a(11) =45a(12) =61a(13) =77a(14) =93a(15) =109a(16) =128a(17) =152a(18) =169a(19) =172a(20) =175a(21) =176a(22) =178a(23) =181a(24) =184a(25) =187a(26) =190a(27) =200a(28) =224a(29) =248