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 A067851 #5 Aug 15 2021 19:42:32
%S A067851 2,26,170,321
%N A067851 Numbers k such that prime(k) divides prime(k^2)-1.
%e A067851 Prime(26) = 101 divides prime(26^2)-1 = 5050 = 50*101, so 26 is a term of the sequence.
%t A067851 Do[If[Mod[Prime[n^2] - 1, Prime[n]] == 0, Print[n]], {n, 1, 10^4}]
%Y A067851 Cf. A067852.
%K A067851 nonn,more
%O A067851 1,1
%A A067851 _Joseph L. Pe_, Feb 15 2002