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 A105107 #13 Sep 08 2022 08:45:17 %S A105107 2,5,6,8,12,18,23,36,38,41,48,50,51,54,57,68,69,71,74,75,80,86,87,89, %T A105107 92,95,101,102,116,120,123,129,131,137,144,146,149,155,159,183,186, %U A105107 204,215,216,219,225,227,228,239,246,249,251,254,257,261,269,278,282 %N A105107 Numbers n such that 10000n + 1001 is prime. %H A105107 Daniel Starodubtsev, <a href="/A105107/b105107.txt">Table of n, a(n) for n = 1..10000</a> %F A105107 a(n) ~ 0.4n log n. %e A105107 n=2: 21001 is prime. %e A105107 n=69: 691001 is prime. %o A105107 (Magma) [ n: n in [1..300] | IsPrime(Seqint([1, 0, 0, 1] cat Intseq(n))) ]; %o A105107 (PARI) is(n)=isprime(10000*n+1001) \\ _Charles R Greathouse IV_, Jun 06 2017 %K A105107 nonn,easy %O A105107 1,1 %A A105107 _Parthasarathy Nambi_, Apr 07 2005