Position of n-th 2 in A030401.

Terms

a(0) =7a(1) =9a(2) =28a(3) =31a(4) =39a(5) =42a(6) =45a(7) =48a(8) =51a(9) =52a(10) =54a(11) =55a(12) =57a(13) =60a(14) =76a(15) =79a(16) =105a(17) =109a(18) =137a(19) =141a(20) =152a(21) =156a(22) =160a(23) =164a(24) =168a(25) =169a(26) =172a(27) =173a(28) =176a(29) =180