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 A172981 #9 Sep 08 2022 08:45:50 %S A172981 2,5,7,11,23,29,31,53,71,79,83,89,97,107,127,131,139,151,167,191,197, %T A172981 211,227,229,239,241,257,269,271,277,281,283,347,349,359,379,383,409, %U A172981 433,449,461,499,521,587,647,673,677,709,739,743,769,787,811,823 %N A172981 Primes p such that 210*p+41 is also prime. %H A172981 Vincenzo Librandi, <a href="/A172981/b172981.txt">Table of n, a(n) for n = 1..1000</a> %t A172981 Select[Prime[Range[1000]], PrimeQ[210 # + 41]&] (* _Vincenzo Librandi_, Dec 31 2013 *) %o A172981 (Magma) [p: p in PrimesUpTo(1000) | IsPrime(210*p+41)]; // _Vincenzo Librandi_, Dec 31 2013 %Y A172981 Cf. A140848. %K A172981 nonn,easy %O A172981 1,1 %A A172981 _Vincenzo Librandi_, Feb 06 2010 %E A172981 Definition modified by _Harvey P. Dale_, Aug 21 2016