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 A298754 #14 Dec 20 2024 02:41:25 %S A298754 1,9,14,73,63,126,172,117,757,567,666,146,1099,1548,882,151,2457,6813, %T A298754 3430,219,2408,5994,6084,1638,15751,9891,1022,12556,12195,7938,14896, %U A298754 12483,9324,22113,10836,55261,25327,6174,15386,567,34461,21672,39754,16206,6813,54756,51912,2114,39331,47253 %N A298754 Numerator of sigma_3(n)/sigma_2(n). %H A298754 Robert Israel, <a href="/A298754/b298754.txt">Table of n, a(n) for n = 1..10000</a> %p A298754 seq(numer(numtheory:-sigma[3](n)/numtheory:-sigma[2](n)),n=1..100); %t A298754 a[n_] := Numerator[DivisorSigma[3, n]/DivisorSigma[2, n]]; Array[a, 100] (* _Amiram Eldar_, Dec 20 2024 *) %o A298754 (PARI) a(n) = numerator(sigma(n, 3)/sigma(n, 2)); \\ _Michel Marcus_, Jan 27 2018 %Y A298754 Cf. A001158, A001157, A000203, A091258, A091259, A091260 (denominator). %K A298754 nonn,frac %O A298754 1,2 %A A298754 _Robert Israel_, Jan 26 2018