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 A175283 #8 Sep 08 2022 08:45:51 %S A175283 2,7,11,17,23,29,31,37,43,73,101,107,127,163,179,197,239,277,281,317, %T A175283 331,359,367,421,457,463,487,541,569,613,617,619,661,709,739,773,787, %U A175283 809,823,877,941,947,953,991,1019,1031,1033,1039,1051,1087,1163,1187 %N A175283 Numbers k with the property that k and k^2 + 3k+9 are primes. %C A175283 Or, primes in A175282. %t A175283 Select[Prime[Range[400]],PrimeQ[ #^2+3*#+9]&] %o A175283 (Magma) [ n: n in [0..1250] | IsPrime(n) and IsPrime(n^2+3*n+9)] // _Vincenzo Librandi_, Jan 30 2011 %Y A175283 Cf. A005471, A175281, A175282. %K A175283 nonn %O A175283 1,1 %A A175283 _Zak Seidov_, Mar 21 2010