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 A115272 #17 Sep 08 2022 08:45:23 %S A115272 29,107,431,1487,1607,2141,5501,10139,10271,17579,22481,23057,27479, %T A115272 32369,36341,36929,38447,55931,57527,69827,75539,78539,79691,81047, %U A115272 81971,84179,86027,89561,93761,102059,112571,113147,118799,119687 %N A115272 Primes p such that p + 2, 18*p^2 + 1, and 18*(p+2)^2 + 1 are all primes. %e A115272 a(1)=29 because 31, 18*29^2 + 1 = 15139, and 18*31^2 + 1 = 17299 are all primes. %o A115272 (Magma) [p: p in PrimesUpTo(200000)| IsPrime(p+2) and IsPrime(18*p^2+1) and IsPrime(18*(p+2)^2+1)] // _Vincenzo Librandi_, Nov 13 2010 %Y A115272 Cf. A089001 (Numbers n such that 2*n^2 + 1 is prime), %Y A115272 A090612 (Numbers k such that the k-th prime is of the form 2*k^2+1), %Y A115272 A090698 (Primes of the form 2*n^2+1), %Y A115272 A113541 (Numbers n such that 18*n^2+1 is a multiple of 19). %K A115272 nonn %O A115272 1,1 %A A115272 _Zak Seidov_, Jan 19 2006 %E A115272 More terms from _Vincenzo Librandi_, Mar 27 2010