A004715 - OEIS (original) (raw)

3, 6, 8, 9, 10, 13, 21, 23, 27, 28, 29, 31, 32, 35, 36, 37, 39, 40, 41, 42, 43, 46, 47, 52, 57, 58, 61, 62, 65, 67, 69, 70, 72, 76, 80, 81, 82, 83, 85, 86, 88, 89, 91, 92, 94, 96, 97, 98, 102, 103, 105, 107, 111, 112

REFERENCES

Steven R. Finch, Mathematical Constants, Cambridge, 2003, pp. 430-433.

MATHEMATICA

Position[Join[{0, 0}, RealDigits[ArcTan[1/2]/Pi, 2, 120][[1]]], 1] // Flatten (* Amiram Eldar, May 22 2023 *)