A031011 - OEIS

A031011

Position of n-th 3 in A031007.

3, 13, 27, 36, 38, 40, 41, 42, 44, 46, 48, 55, 69, 83, 100, 121, 142, 155, 158, 161, 163, 164, 167, 170, 173, 184, 205, 226, 247, 268, 289, 302, 305, 308, 310, 311, 314, 317, 320, 331, 352, 373, 387, 390, 393, 394, 396, 399, 402

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OFFSET

1,1

LINKS

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

MATHEMATICA

(Position[Flatten[Table[Reverse[IntegerDigits[n, 7]], {n, 0, 200}]], 3]//Flatten)-1 (* Harvey P. Dale, Sep 10 2024 *)

CROSSREFS

Sequence in context: A366939 A335747 A066947 * A271625 A099062 A318368

Adjacent sequences: A031008 A031009 A031010 * A031012 A031013 A031014

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved