Numbers k such that k < first location of string of k in decimal expansion of Pi.

Terms

a(0) =0a(1) =2a(2) =3a(3) =6a(4) =7a(5) =8a(6) =10a(7) =11a(8) =12a(9) =13a(10) =16a(11) =17a(12) =18a(13) =19a(14) =20a(15) =21a(16) =22a(17) =24a(18) =25a(19) =27a(20) =28a(21) =29a(22) =30a(23) =31a(24) =34a(25) =36a(26) =37a(27) =39a(28) =40a(29) =42