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 A067803 #11 Jun 04 2016 03:17:00 %S A067803 532,954,104944,918080,10368512,25316030960,35053995440,45883878740 %N A067803 Numbers n such that sigma(n)-sigma(n+1)=n. %C A067803 Mersenne primes are solutions to sigma(n+1)-sigma(n)=n. Conjecture: sequence gives even values only. %C A067803 Subsequence of A223136. a(9) > 10^13. - _Giovanni Resta_, Jun 04 2016 %Y A067803 Cf. A223136. %K A067803 nonn %O A067803 1,1 %A A067803 _Benoit Cloitre_, Feb 07 2002 %E A067803 a(4)-a(8) from _Donovan Johnson_, Feb 01 2009