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A031953 n-th number in which the number of distinct base 8 digits is 2. 2
8, 10, 11, 12, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23, 24, 25, 26, 28, 29, 30, 31, 32, 33, 34, 35, 37, 38, 39, 40, 41, 42, 43, 44, 46, 47, 48, 49, 50, 51, 52, 53, 55, 56, 57, 58, 59, 60, 61, 62, 64, 65, 72, 74, 75, 76, 77, 78, 79, 81, 82, 89 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

Index entries for 2-automatic sequences.

MATHEMATICA

Select[Range[100], Length[Union[IntegerDigits[#, 8]]]==2&] (* Harvey P. Dale, Feb 15 2019 *)

PROG

(PARI) is(n)=#Set(digits(n, 8))==2 \\ Charles R Greathouse IV, Feb 15 2017

CROSSREFS

Sequence in context: A010733 A066004 A107032 * A043697 A043624 A043425

Adjacent sequences:  A031950 A031951 A031952 * A031954 A031955 A031956

KEYWORD

nonn,base,easy

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified August 20 22:45 EDT 2019. Contains 326155 sequences. (Running on oeis4.)