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 A060301 #6 Nov 16 2017 16:28:18 %S A060301 2,3,5,30,180,300,450,1080,1800,2700,3000,4500,6480,6750,10800,16200, %T A060301 18000,27000,30000,38880,40500,45000,64800,67500,97200,101250,108000, %U A060301 162000,180000,233280,243000,270000,300000,388800,405000,450000,583200 %N A060301 For n>3: a(n) is a multiple of three distinct earlier terms. %H A060301 R. G. Wilson, V, <a href="/A007335/a007335.pdf">Note, n.d.</a> %F A060301 a(n) is of the form 2^b*3^c*5^d where either b+c+d=1, or where each of b, c and d are positive and the largest of the three is an odd number less than the sum of the other two. For n>3: a(n) is 30 times a power of 6 times a power of 10 times a power of 15. %e A060301 a(15) = 10800 = 2*30*180 = a(1)*a(4)*a(5). %Y A060301 Cf. A000423. %K A060301 nonn %O A060301 1,1 %A A060301 _Henry Bottomley_, Mar 28 2001