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 A135120 Numbers such that the digital sum base 2 and the digital sum base 3 and the digital sum base 10 all are equal. 10
 1, 21, 222, 223, 1230, 1231, 1502, 2200, 2201, 3012, 3013, 10431, 12214, 12215, 12250, 12251, 14102, 15003, 15021, 16011, 20040, 20041, 22130, 23211, 23230, 23231, 24003, 30070, 30071, 30105, 30231, 30321, 31005, 31150, 31151, 31420 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS G. C. Greubel, Table of n, a(n) for n = 1..1100 EXAMPLE a(2)=21, since ds_2(21)=ds_3(21)=ds_10(21)=3. MATHEMATICA Select[Range[5000], Total[IntegerDigits[#, 2]] == Total[IntegerDigits[#, 3]] ==  Total[IntegerDigits[#, 10]] &] (* G. C. Greubel, Sep 26 2016 *) PROG (PARI) is(n)=my(t=sumdigits(n)); t==hammingweight(n) && t==sumdigits(n, 3) \\ Charles R Greathouse IV, Sep 26 2016 CROSSREFS Cf. A000040, A007953, A054899, A131451, A133620, A133900, A134599, A135110. Sequence in context: A008421 A134585 A165402 * A027812 A171112 A171108 Adjacent sequences:  A135117 A135118 A135119 * A135121 A135122 A135123 KEYWORD nonn,base AUTHOR Hieronymus Fischer, Dec 24 2007 STATUS approved

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Last modified April 13 21:24 EDT 2021. Contains 342941 sequences. (Running on oeis4.)