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 A120993 #7 Oct 19 2017 03:15:03 %S A120993 3,6,10,15,17,19,21,26,30,33,39,42,46,51,53,55,57,62,66,69,74,78,82, %T A120993 87,89,91,93,97,102,105,111,114,118,122,127,129,134,138,141,146,149, %U A120993 151,154,159,161,163,165,170,174,177,183,186,190,195,197,199,201,206 %N A120993 a(n) is the integer in the n-th run of squarefree integers which is divisible by the number of integers in that run. %e A120993 The runs of squarefree integers are: %e A120993 (1,2,3),(5,6,7),(10,11),(13,14,15),(17),(19),(21,22,23),... %e A120993 Since the 7th run has 3 terms, a(7) = 21, the multiple of 3. %Y A120993 Cf. A120992. %K A120993 nonn %O A120993 1,1 %A A120993 _Leroy Quet_, Jul 21 2006 %E A120993 More terms from _Don Reble_, Aug 01 2006