This site is supported by donations to The OEIS Foundation.

 Annual Appeal: Please make a donation to keep the OEIS running. In 2018 we replaced the server with a faster one, added 20000 new sequences, and reached 7000 citations (often saying "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 15 20:49 EST 2018. Contains 318154 sequences. (Running on oeis4.)