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 A222306 #11 Jul 09 2025 04:36:01
%S A222306 0,2,4,7,14,16,18,31,32,38,52,54,56,70,74,79,86,108,112,117,122,126,
%T A222306 128,130,144,151,182,189,196,234,247,248,250,252,254,256,266,268,304,
%U A222306 326,333,338,364,367,378,416,430,432,434,436,448,486,500,511,515,518,542,549,556,558,560,592,632,635,662,670,679,682
%N A222306 Numbers k such that 4k is in A045980.
%H A222306 Charles R Greathouse IV, <a href="/A222306/b222306.txt">Table of n, a(n) for n = 1..10000</a>
%o A222306 (PARI) T=thueinit('z^3+1);is(n)=n==0 || #thue(T, 4*n)>0 \\ _Charles R Greathouse IV_, Nov 29 2014
%Y A222306 Cf. A045980, A222304, A222305.
%K A222306 nonn
%O A222306 1,2
%A A222306 _N. J. A. Sloane_, Feb 15 2013, based on a suggestion from _Allan C. Wechsler_