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 A023198 #23 Dec 04 2019 03:54:20 %S A023198 27720,30240,32760,50400,55440,60480,65520,75600,83160,85680,90720, %T A023198 95760,98280,100800,105840,110880,115920,120120,120960,128520,131040, %U A023198 138600,141120,143640,151200,163800,166320,171360,176400,180180,181440,184800 %N A023198 Numbers k such that sigma(k) >= 4*k. %C A023198 Called 4-abundant numbers. The first odd number is A119240(4) = 1853070540093840001956842537745897243375. - _T. D. Noe_, Mar 31 2011 %D A023198 Melvyn B. Nathanson, Elementary Methods in Number Theory, Springer, 2000, p 260. %H A023198 Amiram Eldar, <a href="/A023198/b023198.txt">Table of n, a(n) for n = 1..10000</a> (terms 1..1000 from T. D. Noe) %t A023198 Select[Range[1000000], DivisorSigma[1, #] >= 4*#&] (* _Vladimir Joseph Stephan Orlovsky_, Apr 21 2010 *) %Y A023198 Union of A027687 and A068404. %K A023198 nonn %O A023198 1,1 %A A023198 _David W. Wilson_