A031003 Position of n-th 4 in A030998.

4, 16, 30, 44, 49, 51, 53, 55, 57, 58, 59, 61, 72, 86, 105, 126, 147, 168, 176, 179, 182, 185, 188, 189, 191, 194, 210, 231, 252, 273, 294, 315, 323, 326, 329, 332, 335, 336, 338, 341, 357, 378, 399, 420, 441, 462, 470, 473, 476

Offset

1,1

Links

Table of n, a(n) for n=1..49.

Mathematica

Flatten[Position[Flatten[IntegerDigits[#, 7]&/@Range[0, 200]], 4]]-1 (* Harvey P. Dale, May 06 2014 *)

Crossrefs

Sequence in context: A227434 A173019 A366814 * A324784 A046001 A239611

Adjacent sequences: A031000 A031001 A031002 * A031004 A031005 A031006

Keyword

nonn

Author

Clark Kimberling

Status

approved