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 A123587 #8 Mar 03 2015 21:59:19 %S A123587 5,4,5,2,3,3,1,5,4,1,6,4,5,2,3,3,1,5,4,1,7,4,5,2,3,3,1,5,4,1,4,4,5,2, %T A123587 3,3,1,5,4,1,5,4,5,2,3,3,1,5,4,1,5,4,5,2,3,3,1,5,4,1,5,4,5,2,3,3,1,5, %U A123587 4,1,6,4,5,2,3,3,1,5,4,1,7,4,5,2,3,3,1,5,4,1,4,4,5,2,3,3,1,5,4,1,5,4,5,2,3,3,1,5,4,1,5,4,5,2,3,3,1,5,4,1 %N A123587 Number of bars that must change on a standard digital clock when the minutes change from n-1 to n. %C A123587 Cyclic with period 60. %e A123587 a(20)=7 because when the clock changes from 19 to 20 minutes, 1 bar turns off and 4 bars turn on in the tens digit for the "0" to become a "1" and 1 bar turns off and 1 turns on in the units digit for the "9" to become a "0". 1 + 4 + 1 + 1 = 7. %Y A123587 Cf. A006942, A010371, A063720. %K A123587 easy,nonn,base,dumb %O A123587 0,1 %A A123587 _Danny Rorabaugh_, Nov 13 2006