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 A072050 #16 Aug 08 2025 03:17:50 %S A072050 7,18718,343,125204947,231012215,11298657013,211066659013, %T A072050 117088913464607,2846847905744815,108244538579770418, %U A072050 2080795357577501075,18312871825384462928,26268977180287044053417,1734582041294009627423816 %N A072050 Smallest solution to GCD(x,A004086(x))=7^n. %F A072050 a(n) = A069554(7^n). %t A072050 (* See A071686. *) %Y A072050 Cf. A004086, A055483, A069554, A071686, A072005, A072021. %K A072050 nonn,base,more %O A072050 1,1 %A A072050 _Labos Elemer_, Jun 10 2002 %E A072050 a(8)-a(9) from _Max Alekseyev_, Jun 17 2011 %E A072050 a(10)-a(14) from _Giovanni Resta_, Oct 30 2019