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 A031951 Numbers in which the number of distinct base 6 digits is 2. 2
 6, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 22, 23, 24, 25, 26, 27, 29, 30, 31, 32, 33, 34, 36, 37, 42, 44, 45, 46, 47, 49, 50, 55, 57, 61, 64, 67, 71, 72, 74, 79, 80, 84, 85, 87, 88, 89, 92, 93, 98, 100, 104, 107, 108, 111, 115, 117 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 MAPLE M:= 6: # get all terms < 6^M sort([seq(seq(seq(seq(add(6^(m-j)*`if`(member(j, S2), d2, d1), j=1..m)  , S2 = combinat:-powerset({\$2..m}) minus {{}}), d2 = {\$0..5} minus {d1}), d1 = 1..5), m=2..M)]); # Robert Israel, Dec 03 2015 MATHEMATICA fQ[n_] := Length@ Union@ IntegerDigits[n, 6] == 2; Select[Range@117, fQ] (* Robert G. Wilson v, Dec 03 2015 *) CROSSREFS Cf. A031948, A031949, A031950, A031952, A031953, A031954, A031955. Sequence in context: A182619 A210447 A135558 * A043610 A043695 A076517 Adjacent sequences:  A031948 A031949 A031950 * A031952 A031953 A031954 KEYWORD nonn,base,easy AUTHOR STATUS approved

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Last modified September 15 20:11 EDT 2019. Contains 327086 sequences. (Running on oeis4.)