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 A171530 #13 Mar 15 2025 15:54:07 %S A171530 1,1,1,1,5,3,7,4,3,5,11,3,13,7,5,16,17,2,19,2,21,2,23,24,25,13,9,7,29, %T A171530 15,31,16,11,34,7,12,37,19,39,5,41,21,43,22,5,23,47,8,49,50,51,13,53, %U A171530 18,55,8,19,29,59,30,61,62,63,64,65,11,67,17,23,35,71,3 %N A171530 Denominator of (n-th nonprime/n). %F A171530 Denominator of (A018252(n)/n). %e A171530 A018252(26) = 38, therefore a(26) = 38/26 = 19/13. - _Georg Fischer_, Mar 15 2025 %Y A171530 Cf. A018252, A171529 (numerator). %K A171530 nonn,frac,easy %O A171530 1,5 %A A171530 _Jaroslav Krizek_, Dec 11 2009 %E A171530 a(26) corrected by _Georg Fischer_, Mar 15 2025