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 A060258 #11 Oct 03 2021 04:47:14
%S A060258 7,8,9,17,29,41,50,55,56,75,76,93,94,95,96,105,126,141,142,159,164,
%T A060258 165,171,179,180,181,184,185,193,199,200,210,211,212,226,242,243,244,
%U A060258 247,248,249,256,275,280,283,311,322,323,324,337,342,346,354,358,359
%N A060258 Numbers k such that 1/prime(k) has period prime(k) - 1 and 1/prime(k+1) has period prime(k+1) - 1.
%C A060258 Numbers k such that k and k+1 are both in A060257. - _Amiram Eldar_, Oct 03 2021
%H A060258 Amiram Eldar, <a href="/A060258/b060258.txt">Table of n, a(n) for n = 1..10000</a>
%t A060258 q[n_] := Module[{p = Prime[n]}, MultiplicativeOrder[10, p] == p - 1]; Select[Range[360], q[#] && q[#+1] &] (* _Amiram Eldar_, Oct 03 2021 *)
%Y A060258 Cf. A060257.
%K A060258 nonn
%O A060258 1,1
%A A060258 _Jeff Burch_, Mar 23 2001
%E A060258 Data corrected by _Amiram Eldar_, Oct 03 2021