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 A117359 #9 Dec 15 2016 02:32:35
%S A117359 1009,6031,9613,19378,49996,67285,91549,101278,102097,107182,142723,
%T A117359 154792,168562,175006,183718,196345,200530,204031,215407,240292,
%U A117359 263395,264628,277723,289171,299323,307684,313111,369676,372601,376921,425935
%N A117359 Indices n == 1 (mod 9) such that the 3 X 3 matrix with components (row by row) prime(n+k), 0 <= k <= 8, has zero determinant.
%C A117359 By considering only indices congruent to 1 (mod 9) each prime occurs in exactly one of these matrices. - Subsequence of A117345.
%o A117359 (PARI) {m=426000;forstep(n=1,m,9,M=matrix(3,3,i,j,prime(n+3*(i-1)+j-1));if(matdet(M,1)==0,print1(n,",")))}
%Y A117359 Cf. A117345.
%K A117359 nonn
%O A117359 1,1
%A A117359 _Cino Hilliard_, Apr 24 2006
%E A117359 Edited by _Klaus Brockhaus_, Apr 28 2006