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 A121024 #23 Apr 18 2020 01:19:26 %S A121024 4,24,40,44,48,64,84,104,124,140,144,148,164,184,204,224,240,244,248, %T A121024 264,284,304,324,340,344,348,364,384,400,404,408,412,416,420,424,428, %U A121024 432,436,440,444,448,452,456,460,464,468,472,476,480,484,488,492,496 %N A121024 Multiples of 4 containing a 4 in their decimal representation. %C A121024 Intersection of A008586 and A011534. %H A121024 <a href="/index/Ar#10-automatic">Index entries for 10-automatic sequences</a>. %F A121024 a(n) ~ 4n. - _Charles R Greathouse IV_, Jul 16 2011 %t A121024 Select[4Range[150],DigitCount[#,10,4]>0&] (* _Harvey P. Dale_, Jun 11 2011 *) %o A121024 (PARI) is(n)=if(n%4,return(0));n=eval(Vec(Str(n)));for(i=1,#n,if(n[i]==4,return(1)));0 \\ _Charles R Greathouse IV_, Jul 16 2011 %Y A121024 Cf. A121041, A011531, A121022, A121023, A121025, A121026, A121027, A121028, A121029, A121030, A121031, A121032, A121033, A121034, A121035, A121036, A121037, A121038, A121039, A121040. %K A121024 nonn,base,easy %O A121024 1,1 %A A121024 _Reinhard Zumkeller_, Jul 21 2006 %E A121024 Typo in comment fixed by _Reinhard Zumkeller_, May 01 2011