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 A064431 #9 Dec 15 2017 17:35:39 %S A064431 6,21,38,44,45,81,164,261,278,4388,9009,114302,41623514,440169957, %T A064431 19033618221,175036435525,341846222877 %N A064431 Numbers n such that |A053222(n)| = tau(n). %o A064431 (PARI) t(n) = abs(sigma(n+1)-sigma(n)) for(n=1,10^6, if(t(n)==numdiv(n),print(n))) %K A064431 more,nonn %O A064431 1,1 %A A064431 _Jason Earls_, Sep 30 2001 %E A064431 a(13)-a(17) from _Giovanni Resta_, Feb 08 2014