Index of n-th 2 in A022303.

Terms

a(0) =2a(1) =4a(2) =5a(3) =7a(4) =8a(5) =11a(6) =14a(7) =15a(8) =17a(9) =20a(10) =22a(11) =23a(12) =26a(13) =29a(14) =31a(15) =32a(16) =34a(17) =35a(18) =38a(19) =40a(20) =41a(21) =43a(22) =46a(23) =49a(24) =50a(25) =52a(26) =53a(27) =56a(28) =58a(29) =59