A323752 Fixed points of A323710.

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

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