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A045128 Numbers whose base-4 representation contains exactly three 1's and four 3's. 0
5631, 6015, 6111, 6135, 6141, 7551, 7647, 7671, 7677, 8031, 8055, 8061, 8151, 8157, 8181, 13695, 13791, 13815, 13821, 14175, 14199, 14205, 14295, 14301, 14325, 15711, 15735, 15741, 15831, 15837, 15861, 16215, 16221 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
Reap[For[n=1, n<20000, n++, If[MatchQ[IntegerDigits[n, 4] // Tally // Sort, {___, {1, 3}, ___, {3, 4}}], Sow[n]]]][[2, 1]] (* Jean-François Alcover, Dec 07 2016 *)
CROSSREFS
Cf. A007090.
Sequence in context: A014799 A031573 A031753 * A229591 A161193 A022010
KEYWORD
nonn,base
AUTHOR
STATUS
approved

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Last modified May 24 12:09 EDT 2024. Contains 372773 sequences. (Running on oeis4.)