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A031956 Numbers with exactly three distinct base-4 digits. 1
18, 19, 24, 27, 28, 30, 33, 35, 36, 39, 44, 45, 49, 50, 52, 54, 56, 57, 66, 67, 70, 71, 72, 73, 74, 76, 77, 79, 82, 83, 88, 91, 92, 94, 96, 97, 98, 100, 103, 104, 107, 109, 110, 111, 112, 113, 115, 116, 118, 121, 122, 123, 124, 126, 129 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..55.

CROSSREFS

Cf. A007090.

Sequence in context: A241848 A146331 A308894 * A095393 A301601 A056022

Adjacent sequences:  A031953 A031954 A031955 * A031957 A031958 A031959

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified November 30 04:10 EST 2021. Contains 349417 sequences. (Running on oeis4.)