This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A135125 #6 Sep 28 2016 05:32:04 %S A135125 1,1300,1301,5010,5011,7102,7103,10050,10051,10235,11135,12250,12251, %T A135125 14015,16102,16103,20060,20061,20206,20207,23230,23231,32012,32013, %U A135125 32302,32303,32410,32411,44000,44001,45010,45011,50012,50013,50300 %N A135125 Numbers such that the digital sum base 2 and the digital sum base 5 and the digital sum base 10 all are equal. %H A135125 G. C. Greubel, <a href="/A135125/b135125.txt">Table of n, a(n) for n = 1..989</a> %e A135125 a(2)=1300, since ds_2(1300)=ds_5(1300)=ds_10(1300), where ds_x=digital sum base x. %t A135125 Select[Range[10000], Total[IntegerDigits[#, 2]] == Total[IntegerDigits[#, 5]] == Total[IntegerDigits[#, 10]] &] (* _G. C. Greubel_, Sep 27 2016 *) %Y A135125 Cf. A007953, A054899, A131451, A133620, A133900, A134599, A135100, A135110, A135120, A037308. %K A135125 nonn,base %O A135125 1,2 %A A135125 _Hieronymus Fischer_, Dec 31 2007