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 A100576 #14 Jun 22 2021 16:21:58 %S A100576 1,3,1,5,2,1,3,4,9,1,11,5,1,8,15,2,1,17,10,3,1,9,2,21,1,3,14,11,1,6,5, %T A100576 16,27,1,29,4,8,1,15,20,2,1,35,2,17,4,1,3,39,1,12,41,26,9,1,6,21,28, %U A100576 45,14,1,5,8,3,1,11,2,51,1,3,34,5,1,18,27,10,57,10,1,59,38,29,1,40,3,1,12 %N A100576 Smallest difference between distinct prime divisors of the n-th non-prime-power. %H A100576 Harvey P. Dale, <a href="/A100576/b100576.txt">Table of n, a(n) for n = 1..1000</a> %e A100576 6 is the first non-prime-power. %e A100576 Since 6 = 2*3 and 3-2 = 1, then a(1) = 1. %t A100576 Min[Differences[FactorInteger[#][[All,1]]]]&/@ Select[Range[ 2,150],!PrimePowerQ[ #]&] (* _Harvey P. Dale_, Jun 22 2021 *) %K A100576 nonn %O A100576 1,2 %A A100576 _Leroy Quet_, Jan 02 2005 %E A100576 More terms from _Franklin T. Adams-Watters_, Aug 29 2006