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 A063794 #20 Jul 17 2023 06:05:51 %S A063794 2,28,1368,1700,342000,2061000,2120832,65834560,89082000 %N A063794 Numbers k such that usigma(k) = k + phi(k). %C A063794 No other terms < 2700000000. - _Jud McCranie_, Nov 04 2001 %o A063794 (PARI) us(n) = sumdiv(n,d, if(gcd(d,n/d)==1,d)); %o A063794 for(n=1,10^8, if(us(n)==n+eulerphi(n),print1(n, ", "))) %Y A063794 Cf. A000010, A034448, A121048. %K A063794 nonn,more %O A063794 1,1 %A A063794 _Jason Earls_, Aug 18 2001 %E A063794 More terms from _Jud McCranie_, Nov 04 2001 %E A063794 Offset corrected by _Mohammed Yaseen_, Jul 17 2023