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 A165810 #18 Feb 03 2024 00:54:47 %S A165810 2,7,11,17,29,41,59,71,79,97,127,137,139,149,151,181,197,199,241,251, %T A165810 277,281,307,337,347,367,379,401,431,479,491,541,569,587,659,701,709, %U A165810 757,797,809,821,827,829,857,877,881,947,991,1021,1051,1109,1117,1129,1151,1229 %N A165810 Primes p such that 18*p+1 is also a prime. %H A165810 Vincenzo Librandi, <a href="/A165810/b165810.txt">Table of n, a(n) for n = 1..1000</a> %F A165810 a(n) = (A165811(n)-1)/18. %e A165810 For p=2, 18*p+1=37. For p=7, 18*p+1=127. For p=11, 18*p+1=199. %t A165810 Select[Prime[Range[1000]],PrimeQ[18#+1]&] (* _Harvey P. Dale_, Mar 06 2011 *) %Y A165810 Cf. A111094, A153400, A165811. %K A165810 nonn,easy %O A165810 1,1 %A A165810 _Vincenzo Librandi_, Sep 28 2009 %E A165810 Extended by _R. J. Mathar_, Oct 16 2009