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 A263930 #12 Apr 27 2017 12:00:52
%S A263930 0,2,27,165,734,3109,11568,40820,137850,457191
%N A263930 Number of quasi-Carmichael numbers less than 10^n.
%C A263930 For quasi-Carmichael numbers see A257750.
%e A263930 a(1) = 0 because there are no quasi-Carmichael numbers below 10^1.
%e A263930 a(2) = 2 because there are two quasi-Carmichael numbers below 10^2, namely, 35 and 77.
%o A263930 (Perl) use ntheory ":all"; my($s,$e)=(0,1); forcomposites { say $e++," $s" if $_ >= 10**$e; $s++ if is_quasi_carmichael($_) } 1e7; # _Dana Jacobsen_, Apr 27 2017
%Y A263930 Cf. A055553, A216929, A257750.
%K A263930 nonn,more,hard
%O A263930 1,2
%A A263930 _Tim Johannes Ohrtmann_, Oct 30 2015
%E A263930 a(8)-a(10) from _Dana Jacobsen_, Apr 27 2017