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 A088071 #3 Dec 05 2013 19:56:32 %S A088071 3,4,6,8,10,12,18,24,26,28,30,42,48,60,72,80,82,102,108,126,138,150, %T A088071 168,180,192,198,228,240,242,270,282,312,348,360,420,432,462,522,570, %U A088071 600,618,642,660,728,810,822,828,840,858,882,1020,1032,1050,1062,1092,1152 %N A088071 Number sandwiched between two numbers having only one prime divisor. %C A088071 A014574 (average of twin prime pairs) is a subsequence. %o A088071 (PARI) for(n=2,1200,if(matsize(factor(n-1))[1]*matsize(factor(n+1))[1]==1,print1(n,","))) %Y A088071 Cf. A014574, A088072. %K A088071 nonn %O A088071 1,1 %A A088071 _Amarnath Murthy_, Sep 22 2003 %E A088071 Edited and extended by _Klaus Brockhaus_, Sep 25 2003