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 A174535 #15 Sep 05 2025 04:45:04 %S A174535 945,1575,2205,2835,3465,4095,4725,5355,5775,5985,6615,6825,7245,7875, %T A174535 8085,8505,9135,9555,9765,10395,11025,11655,12285,12705,12915,13545, %U A174535 14175,14805,15015,15435,16065,16695,17325,17955,18585,19215,19635 %N A174535 Odd almost practical numbers. %C A174535 This is Stewart's set O*. Note that 15 divides all such numbers. This sequence appears to be a subsequence of the odd abundant numbers, A005231. See A174533 for additional comments. %H A174535 Amiram Eldar, <a href="/A174535/b174535.txt">Table of n, a(n) for n = 1..4000</a> %H A174535 B. M. Stewart, <a href="http://doi.org/10.2307/2372651">Sums of distinct divisors</a>, American Journal of Mathematics, Vol. 76, No. 4 (1954), pp. 779-785. %Y A174535 Cf. A005231, A174533, A174534. %K A174535 nonn,changed %O A174535 1,1 %A A174535 _T. D. Noe_, Mar 21 2010