Position of n-th 1 in A031312.

Terms

a(0) =1a(1) =6a(2) =7a(3) =8a(4) =10a(5) =12a(6) =14a(7) =17a(8) =27a(9) =37a(10) =47a(11) =57a(12) =67a(13) =77a(14) =87a(15) =96a(16) =98a(17) =99a(18) =102a(19) =105a(20) =108a(21) =111a(22) =112a(23) =113a(24) =114a(25) =115a(26) =117a(27) =118a(28) =120a(29) =121