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 A185656 #19 May 22 2022 02:14:54 %S A185656 11,601,601,601,107839,577937,8341631,8341631,8341631,8341631,8341631, %T A185656 166778433637,4054944029077,58520914386689 %N A185656 Final prime in first term of A019518 that is divisible by 7^n. %e A185656 None of the numbers 2, 23, 235, and 2357 are divisible by 11, but 235711 is divisible by 7, so a(1)=11. %e A185656 Not until the concatenation through 601 is such a number divisible by 7^2, so a(2)=601. %Y A185656 Cf. A183194 and immediately following entries. %K A185656 nonn,base,more %O A185656 1,1 %A A185656 _James G. Merickel_, Feb 01 2011 %E A185656 a(12) added by _James G. Merickel_, Mar 29 2013 %E A185656 a(12) corrected and a(13)-a(14) added by _Seth A. Troisi_, May 18 2022