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 A247280 #11 Sep 17 2014 15:53:28 %S A247280 4,6,8,19,50,59,63,65,78,85,93,112,117,143,237,254,264,276,287,303, %T A247280 333,371,380,425,435,440,447,459,483,485,537,612,614,659,731,851,877, %U A247280 920,983,994,1025,1080,1096,1182,1358,1380,1468,1476,1481,1582,1628,1690 %N A247280 Numbers n for which A242720(n) = prime(n)*(prime(n)+4)+3. %C A247280 prime(n)*(prime(n)+4) + 3, such that prime(n)+4 and prime(n)*(prime(n)+4)+2 are primes, is the second minimal possible value of A242720(n) after (prime(n)+1)^2 + 2, n>=3 (cf. A246824). %Y A247280 Cf. A242719, A242720, A242847, A245363, A246748, A246824, A247011. %K A247280 nonn %O A247280 1,1 %A A247280 _Vladimir Shevelev_, Sep 11 2014 %E A247280 More terms from _Peter J. C. Moses_, Sep 11 2014