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 A246853 #20 Sep 08 2022 08:46:09 %S A246853 7,6285,4693485,54028959,75898473,724416741,2359059709,4901493769, %T A246853 321212249593,511578306649,534245763769,6158645822473 %N A246853 Numbers n such that sigma(n+3) - sigma(n) = n + 3. %C A246853 Also numbers n such that A001065(n+3) = A000203(n). - _Michel Marcus_, Sep 06 2014 %C A246853 a(13) > 10^13. - _Giovanni Resta_, Jul 13 2015 %e A246853 Number 7 is in sequence because sigma(7+3) - sigma(7) = 18 - 8 = 10 = 7 + 3. %o A246853 (Magma) [n:n in[1..10^7] | SumOfDivisors(n+3)-SumOfDivisors(n) eq n+3] %o A246853 (PARI) %o A246853 for(n=1,10^7,if(sigma(n+3)-sigma(n)==n+3,print1(n,", "))) \\ _Derek Orr_, Sep 05 2014 %Y A246853 Cf. A000203, A067816, A246851, A246852, A246854, A246855. %K A246853 nonn,more %O A246853 1,1 %A A246853 _Jaroslav Krizek_, Sep 05 2014 %E A246853 a(4)-a(8) from _Hiroaki Yamanouchi_, Sep 10 2014 %E A246853 a(9)-a(12) from _Giovanni Resta_, Jul 13 2015