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A045103
Numbers whose base-4 representation contains exactly three 1's and three 2's.
0
1386, 1434, 1446, 1449, 1626, 1638, 1641, 1686, 1689, 1701, 2394, 2406, 2409, 2454, 2457, 2469, 2646, 2649, 2661, 2709, 4458, 4506, 4518, 4521, 4698, 4710, 4713, 4758, 4761, 4773, 5226, 5274, 5286, 5289, 5418, 5514
OFFSET
1,1
MATHEMATICA
Select[Range[6000], DigitCount[#, 4, 1]==DigitCount[#, 4, 2]==3&] (* Harvey P. Dale, Sep 10 2011 *)
CROSSREFS
Cf. A007090.
Sequence in context: A060062 A181991 A212222 * A175695 A286837 A023090
KEYWORD
nonn,base
STATUS
approved