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 A073329 #19 Jan 09 2021 17:57:11 %S A073329 2,10,60,420,4290,53130,903210,17687670,406816410,11125544430, %T A073329 338431883790,11833068917670,457077357006270,20384767656323070, %U A073329 955041577211912190,49230430891074322890,2740956243836856315270,168909608387276001835590,11054926927790884163355330 %N A073329 a(n) is the n-th number to have n distinct prime factors. %H A073329 David A. Corneth, <a href="/A073329/b073329.txt">Table of n, a(n) for n = 1..350</a> (terms <= 10^1000) %F A073329 A001221(a(n)) = n <= A001222(a(n)). - _Alois P. Heinz_, Jan 09 2021 %e A073329 a(1) = 2 because 2 is the first number to have one prime factor. %e A073329 a(2) = 10 because 10 is the second number to have two prime factors; 6 is the first. %e A073329 a(3) = 60 = 2*2*3*5 because 60 is the third number to have three prime factors (2,3,5); 30 is the first and 42 is the second. %Y A073329 a(n) is last term in n-th row of A048692. %Y A073329 Cf. A001221, A001222, A340467. %K A073329 nonn %O A073329 1,1 %A A073329 _Robert G. Wilson v_, Aug 22 2002 %E A073329 Edited by _Dean Hickerson_, Nov 03 2002 %E A073329 More terms from _Sascha Kurz_, Jan 03 2003 %E A073329 Corrected from a(9) onwards by _T. D. Noe_, Dec 01 2004 %E A073329 More terms from _David A. Corneth_, Jan 09 2021