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 A250044 #10 Jan 29 2015 09:48:43
%S A250044 1,8,9,10,11,12,13,14,15,65,67,69,71,73,74,76,77,79,81,83,87,89,90,91,
%T A250044 92,93,94,95,97,101,103,105,106,107,108,109,110,111,113,115,117,121,
%U A250044 122,124,127,521,522,523,524,526,527,537
%N A250044 Numbers n such that m = floor(n/8) is coprime to n and, if nonzero, m is also a term of the sequence.
%C A250044 See the comments in A250040 which all apply, except for the setting of the base, b=8. In particular, they define the property RTC(b).
%H A250044 Stanislav Sykora, <a href="/A250044/b250044.txt">Table of n, a(n) for n = 1..10000</a>
%H A250044 Stanislav Sykora, <a href="https://oeis.org/wiki/File:GeneticThreads.txt">PARI/GP scripts for genetic threads</a>, with code and comments.
%H A250044 Wikipedia, <a href="http://en.wikipedia.org/wiki/Coprime_integers">Coprime integers</a>
%o A250044 (PARI) See the link
%o A250044 (PARI) is_rtc(n, b=8) = {while (((m=gcd(n\b, n)) == 1), if (m == 0, return (1)); if ((n=n\b) == 0, return (1));); return (0);} \\ _Michel Marcus_, Jan 18 2015
%Y A250044 Cf. A250040 (b=10), A250045.
%Y A250044 Other lists of right-truncatable numbers with the property RTC(b): A250036 (b=4), A250038 (b=16), A250042 (b=9), A250046 (b=7), A250048 (b=6), A250050 (b=5).
%K A250044 nonn,base
%O A250044 1,2
%A A250044 _Stanislav Sykora_, Jan 15 2015