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 A375471 #20 Jul 04 2025 15:33:38 %S A375471 3,4,16,61,1861,4979,90191,58981439,10024953661 %N A375471 Integers equal to the sum of divisors of their anti-divisors. %C A375471 Tested up to 2*10^10. - _Giovanni Resta_, Aug 19 2024 %e A375471 Anti-divisors of 1861 are 2, 3, 17, 51, 61, 73, 219, 1241 and %e A375471 sum of sigmas = 3 + 4 + 18 + 72 + 62 + 74 + 296 + 1332 = 1861. %Y A375471 Cf. A000203, A066417, A178029. %K A375471 nonn,hard,more %O A375471 1,1 %A A375471 _Paolo P. Lava_, Aug 17 2024 %E A375471 a(8)-a(9) from _Giovanni Resta_, Aug 19 2024