A031492 - OEIS

A031492

Numbers whose base-9 representation has the same number of 0's as 8's.

1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 15, 16, 19, 20, 21, 22, 23, 24, 25, 28, 29, 30, 31, 32, 33, 34, 37, 38, 39, 40, 41, 42, 43, 46, 47, 48, 49, 50, 51, 52, 55, 56, 57, 58, 59, 60, 61, 64, 65, 66, 67, 68, 69, 70, 72, 89, 91, 92, 93, 94, 95

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..63.

MATHEMATICA

Select[Range@100, (s=#; Differences[Count[IntegerDigits[s, 9], #]&/@{0, 8}]=={0})&] (* Giorgos Kalogeropoulos, Jul 04 2021 *)

Select[Range[100], DigitCount[#, 9, 0]==DigitCount[#, 9, 8]&] (* Harvey P. Dale, Mar 09 2023 *)

CROSSREFS

Cf. A007095.

Sequence in context: A039155 A007094 A000433 * A350076 A035060 A231272

Adjacent sequences: A031489 A031490 A031491 * A031493 A031494 A031495

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved