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 A202607 #15 May 13 2013 01:50:01 %S A202607 1,5,77,177,215,247,313,348,465,593,712,723,1092,1110,1218,1335,1433, %T A202607 1470,1673,1738,1755,1815,1990,2007,2153,2223,2293,2830,2903,2930, %U A202607 3042,3332,3598,3673,3790,3957,4308,4477,4623,5338,5548,5955,6258,6297,7030,7095 %N A202607 Numbers n such that 6n and sigma(6n) are both a twin prime average. %e A202607 a(4)=177 because 6*177-1=1061, 6*177+1=1063, A000203(6*177)-1=2339 and A000203(6*177)+1=2341 are all primes. %o A202607 (PARI) for(n=1,1e4,if(isprime(6*n-1)&&isprime(6*n+1)&&isprime(sigma(6*n)-1)&&isprime(sigma(6*n)+1),print1(n", "))) \\ _Charles R Greathouse IV_, Dec 26 2011 %Y A202607 Cf. A000203, A014574, A193687. %K A202607 nonn,less %O A202607 1,2 %A A202607 _Juri-Stepan Gerasimov_, Dec 21 2011