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A335134 Fixed points of A335133. 1

%I

%S 0,1,2,3,4,5,6,7,8,9,14,15,16,17,18,19,28,29,30,31,32,33,36,37,58,59,

%T 62,63,64,65,66,67,72,73,74,75,116,117,118,119,124,125,126,127,128,

%U 129,134,135,146,147,148,149,234,235,236,237,248,249,254,255,256

%N Fixed points of A335133.

%C The EQ-triangles generated from the binary expansion of the terms of this sequence have reflection symmetry through axis U-U:

%C . U

%C . .___________

%C . \ . /

%C . \ . /

%C . \ .

%C . \ / .

%C . \ / U

%C . v

%H Rémy Sigrist, <a href="/A335134/a335134.png">Illustration of initial terms</a>

%e A335133(28) = 28, so 28 belongs to this sequence.

%o (PARI) is(n) = {

%o my (b=binary(n), v=0);

%o forstep (x=#b-1, 0, -1,

%o if (b[1], v+=2^x);

%o b=vector(#b-1, k, b[k]==b[k+1])

%o );

%o v==n

%o }

%Y Cf. A335133.

%K nonn,base

%O 1,3

%A _Rémy Sigrist_, May 24 2020

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Last modified September 24 01:21 EDT 2020. Contains 337315 sequences. (Running on oeis4.)