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A323752 Fixed points of A323710. 2
1, 6, 28, 40, 240, 544, 832, 1152, 2816, 50176, 118784, 131584, 409600, 1050624, 1056768, 1081344, 2031616, 8519680, 118489088, 201588736, 352321536, 6446645248, 15300820992, 25836912640, 104152956928, 150323855360, 1099545182208, 3315714752512, 4398583382016 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

If f(n) denotes the binary tree representation of n defined in A323710, then this sequence lists the n such that f(n) is symmetrical.

LINKS

Luc Rousseau, Table of n, a(n) for n = 1..200

Luc Rousseau, A program to compute this sequence (SWI-Prolog)

EXAMPLE

The recursive decomposition of 50176 with formula "parent = (2^left)*(2*right+1)" gives the following binary tree representation:

         o

        / \

       /   \

      /     \

     o       o

    / \     / \

   o   o   o   o

      /     \

     o       o

This tree is symmetrical, so 50176 is in the sequence.

PROG

(SWI-Prolog) See link.

CROSSREFS

Cf. A323710.

Sequence in context: A071834 A295078 A055196 * A120624 A138873 A091307

Adjacent sequences:  A323749 A323750 A323751 * A323753 A323754 A323755

KEYWORD

nonn

AUTHOR

Luc Rousseau, Jan 26 2019

STATUS

approved

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Last modified October 15 21:17 EDT 2019. Contains 328038 sequences. (Running on oeis4.)