A031471 Numbers whose base-5 representation has one more 0 than 4's.

5, 10, 15, 26, 27, 28, 30, 35, 40, 51, 52, 53, 55, 60, 65, 76, 77, 78, 80, 85, 90, 100, 129, 131, 132, 133, 136, 137, 138, 141, 142, 143, 145, 151, 152, 153, 155, 160, 165, 176, 177, 178, 180, 185, 190, 201, 202, 203, 205, 210, 215

Offset

1,1

Links

Table of n, a(n) for n=1..51.

Mathematica

Select[Range@300, (s=#; Differences[Count[IntegerDigits[s, 5], #]&/@{0, 4}]=={-1})&] (* Giorgos Kalogeropoulos, Jul 04 2021 *)

Crossrefs

Cf. A007091.

Sequence in context: A008439 A276514 A340961 * A045206 A138521 A225701

Adjacent sequences: A031468 A031469 A031470 * A031472 A031473 A031474

Keyword

nonn,base

Author

Clark Kimberling

Status

approved