A038099 a(n) > first location of string of a(n) in decimal expansion of Pi.

4, 5, 9, 14, 15, 23, 26, 32, 33, 35, 38, 41, 43, 46, 50, 51, 53, 58, 59, 62, 64, 65, 69, 71, 74, 75, 78, 79, 81, 82, 83, 84, 86, 88, 89, 92, 93, 94, 95, 97, 98, 99, 105, 117, 132, 141, 148, 159, 164, 169, 170, 172, 174, 193, 197, 208, 209, 211, 214, 223, 229, 230, 231