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 A199595 #7 Jul 03 2013 09:24:23 %S A199595 1,4,9,11,14,18,21,23,24,31,32,33,34,37,40,41,44,46,49,51,54,55,60,61, %T A199595 62,64,65,66,71,74,75,77,79,81,84,88,89,91,92,93,94,99,100,101,102, %U A199595 104,106,107,111,113,114,116,118,121,123,124,127,128,130,131,134,135,138,141,143,144,149,150,151,153,154,157,158,161,163,164,165,168,169,170 %N A199595 Numbers n such that 3n+6, 3n+7 and 3n+8 are all composite. %D A199595 Ernest V. Miliauskas, letter to _N. J. A. Sloane_, Dec 21 1985. %F A199595 a(n) = A199593(n)-8. %o A199595 (PARI) is(n)=!isprime(bitor(3*n+7,1)) \\ _Charles R Greathouse IV_, Jul 03 2013 %K A199595 nonn,easy %O A199595 1,2 %A A199595 _N. J. A. Sloane_, Nov 08 2011