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A023735
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Numbers with exactly 2 3's in their base-5 expansion.
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4
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18, 43, 68, 78, 83, 88, 90, 91, 92, 94, 98, 118, 143, 168, 193, 203, 208, 213, 215, 216, 217, 219, 223, 243, 268, 293, 318, 328, 333, 338, 340, 341, 342, 344, 348, 368, 378, 383, 388, 390, 391, 392, 394, 398, 403, 408, 413, 415, 416, 417, 419, 423
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OFFSET
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1,1
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LINKS
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MAPLE
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seq(`if`(numboccur(3, convert(n, base, 5))=2, n, NULL), n=0..450); # Nathaniel Johnston, Jun 27 2011
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MATHEMATICA
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Select[ Range[ 450 ], (Count[ IntegerDigits[ #, 5 ], 3 ]==2)& ]
Select[Range[500], DigitCount[#, 5, 3]==2&] (* Harvey P. Dale, Mar 24 2021 *)
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CROSSREFS
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KEYWORD
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nonn,base,easy
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AUTHOR
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STATUS
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approved
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