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A031954 Numbers with exactly two distinct base-9 digits. 4
9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 24, 25, 26, 27, 28, 29, 31, 32, 33, 34, 35, 36, 37, 38, 39, 41, 42, 43, 44, 45, 46, 47, 48, 49, 51, 52, 53, 54, 55, 56, 57, 58, 59, 61, 62, 63, 64, 65, 66, 67, 68, 69, 71, 72, 73, 74, 75, 76 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..61.

PROG

(PARI) a(n)=n+8+(n+7)\9 \\ Charles R Greathouse IV, Mar 10 2021

CROSSREFS

Cf. A007095.

Sequence in context: A107576 A263772 A043698 * A043631 A043457 A202707

Adjacent sequences:  A031951 A031952 A031953 * A031955 A031956 A031957

KEYWORD

nonn,base,easy

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified January 27 15:45 EST 2022. Contains 350607 sequences. (Running on oeis4.)