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 A270072 #16 Apr 09 2016 16:23:15 %S A270072 15,33,231,561,3735,8673,58407,146673,951831,2200161,15007527, %T A270072 37618161,243401751,562961505,3835839783,9654230001,62277025815, %U A270072 1438881404513,981400027431,2471753680881,15945066090519,38848671944801,251274914238759,633024492828657,4081389310836759,589338770407521,6431706870343299,161989104772314217,1044976403211096087 %N A270072 Decimal representation of the n-th iteration of the Conway’s game of life starting with four adjacent rows of lines turned on to positive and negative infinity. %C A270072 It is conjectured that every term has a prime factor that does not divide any previous term. %e A270072 0th iteration = 1111 = 15, 1st iteration = 100001 = 33, 2nd iteration = 11100111 = 231, 3rd iteration = 1000110001 = 561, 4th iteration = 111010010111 = 3735, 5th iteration = 10000111100001 = 8673, ... . %K A270072 nonn %O A270072 0,1 %A A270072 _Brook Estifanos_, Mar 09 2016