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 A291176 #22 Jul 23 2021 02:08:28 %S A291176 3,8,20,146139,584835,44814015,1436395095,9988999095,25997557299, %T A291176 193861767939,2105722150095,3921293253003,8234992646643 %N A291176 Numbers k such that s(k) = s(k-1) + s(k-2), where s(k) is the sum of proper divisors of k (A001065). %C A291176 a(14) > 10^13. - _Giovanni Resta_, Feb 25 2020 %e A291176 s(146139) = 76581 = 75802 + 779 = s(146138) + s(146137), therefore 146139 is in the sequence. %t A291176 s[n_]:=DivisorSigma[1,n]-n; Select[Range[10^6], s[#]==s[#-1]+s[#-2] &] %Y A291176 Cf. A001065, A065557, A065900, A076136, A076251, A145469. %K A291176 nonn,more %O A291176 1,1 %A A291176 _Amiram Eldar_, Aug 19 2017 %E A291176 a(7)-a(10) from _Giovanni Resta_, Aug 29 2017 %E A291176 a(11)-a(13) from _Giovanni Resta_, Feb 25 2020