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 A028876 #34 Feb 16 2025 08:32:35 %S A028876 4,6,8,12,14,16,22,24,32,34,36,38,42,44,46,52,58,64,72,74,78,82,94, %T A028876 102,112,116,122,132,144,152,164,166,168,174,176,182,184,186,188,198, %U A028876 204,212,222,226,232,234,236,252,262,264,278,284,288,292,298,302,318,324 %N A028876 Numbers k such that k^2 - 5 is prime. %H A028876 G. C. Greubel, <a href="/A028876/b028876.txt">Table of n, a(n) for n = 1..1000</a> %H A028876 P. De Geest, <a href="https://www.worldofnumbers.com/consemor.htm">Palindromic Quasipronics of the form n(n+x)</a> %H A028876 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Near-SquarePrime.html">Near-Square Prime</a> %t A028876 Select[Range[400], PrimeQ[#^2 - 5] &] (* _Alonso del Arte_, Aug 27 2013 *) %o A028876 (Magma) [n: n in [2..1000] |IsPrime(n^2 - 5 )]; // _Vincenzo Librandi_, Nov 18 2010 %o A028876 (PARI) is(n)=isprime(n^2-5) \\ _Charles R Greathouse IV_, Jun 06 2017 %Y A028876 Cf. A028875, A028877. %K A028876 nonn,easy %O A028876 1,1 %A A028876 _Patrick De Geest_