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 A262105 #16 Jul 25 2021 02:40:33
%S A262105 11,25,55,77,101,151,165,205,231,347,421,525,741,777,1061,1111,1205,
%T A262105 1213,1535,1665,1751,2121,2401,2525,2553,2611,3005,3161,3175,3301,
%U A262105 3371,3561,3777,4171,4641,4705,5215,5405,6111,6143
%N A262105 Pseudoprimes to base 8, written in base 8.
%H A262105 Amiram Eldar, <a href="/A262105/b262105.txt">Table of n, a(n) for n = 1..10000</a>
%F A262105 a(n) = A007094(A020137(n)).
%t A262105 base = 8; t = {}; n = 1;
%t A262105 While[Length[t] < 40, n++;
%t A262105 If[! PrimeQ[n] && PowerMod[base, n - 1, n] == 1, AppendTo[t, FromDigits@ IntegerDigits[n, 8]]]]; t
%Y A262105 Cf. A007094 (Numbers in base 8), A020137 (Pseudoprimes to base 8).
%Y A262105 Cf. A258189, A262101, A262102, A262103, A262104, A262154.
%K A262105 nonn,base
%O A262105 1,1
%A A262105 _Abdul Gaffar Khan_, Sep 11 2015