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A043504
Numbers having four 3's in base 10.
2
3333, 13333, 23333, 30333, 31333, 32333, 33033, 33133, 33233, 33303, 33313, 33323, 33330, 33331, 33332, 33334, 33335, 33336, 33337, 33338, 33339, 33343, 33353, 33363, 33373, 33383, 33393, 33433, 33533, 33633, 33733
OFFSET
1,1
LINKS
MATHEMATICA
Select[Range[34000], DigitCount[#, 10, 3]==4&] (* Harvey P. Dale, Feb 02 2011 *)
CROSSREFS
Subsequence of A011533.
Sequence in context: A253538 A147881 A230307 * A251331 A261656 A231955
KEYWORD
nonn,base
STATUS
approved