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 A030636 #33 May 05 2023 09:47:55 %S A030636 180,252,288,300,396,450,468,588,612,684,700,768,800,828,882,972,980, %T A030636 1044,1100,1116,1280,1300,1332,1452,1476,1548,1568,1575,1692,1700, %U A030636 1792,1900,1908,2028,2124,2156,2178,2196,2205,2300,2412,2420,2450 %N A030636 Numbers with 18 divisors. %C A030636 Numbers of the form p^17, p*q^8 (A179668), p*q^2*r^2 (A179643) or p^2*q^5 (A179646), where p, q and r are distinct primes. - _R. J. Mathar_, Mar 01 2010 %H A030636 R. J. Mathar, <a href="/A030636/b030636.txt">Table of n, a(n) for n = 1..1000</a> %t A030636 Select[Range[2500],DivisorSigma[0,#]==18&] (* _Harvey P. Dale_, Feb 01 2011 *) %o A030636 (PARI) is(n)=numdiv(n)==18 \\ _Charles R Greathouse IV_, Jun 19 2016 %Y A030636 Cf. A030635 (17 divs), A030637 (19 divs). %K A030636 nonn %O A030636 1,1 %A A030636 _Jeff Burch_ %E A030636 882 inserted by _N. J. A. Sloane_, Mar 26 2007