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 A048717 #15 Jan 01 2021 11:23:11
%S A048717 0,3,6,7,12,14,15,24,28,30,31,48,51,56,60,62,63,96,99,102,103,112,115,
%T A048717 120,124,126,127,192,195,198,199,204,206,207,224,227,230,231,240,243,
%U A048717 248,252,254,255,384,387,390,391
%N A048717 Binary expansion matches ((0)*00(1*)11)*(0*).
%C A048717 In binary expansion, 1-bits occur only in groups of two or more, separated from other such groups by at least two 0-bits.
%C A048717 Integers that satisfy A048727(n) = 3*n.
%H A048717 <a href="/index/Con#CongruCrossDomain">Index entries for sequences defined by congruent products between domains N and GF(2)[X]</a>
%t A048717 filterQ[n_] := !MatchQ[IntegerDigits[n, 2], {1}|{1, 0, ___}|{___, 0, 1}|{___, 1, 0, 1, ___}|{___, 0, 1, 0, ___}];
%t A048717 Select[Range[0, 400], filterQ] (* _Jean-François Alcover_, Dec 31 2020 *)
%Y A048717 Row 3 of A115872. Superset of A048719. Cf. A048733.
%K A048717 nonn,base,easy
%O A048717 0,2
%A A048717 _Antti Karttunen_, Mar 30 1999