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

Author

Luc Rousseau, Jan 26 2019

Keywords

• nonn

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.

Examples

			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.
		

Links

• Luc Rousseau, Table of n, a(n) for n = 1..200
• Luc Rousseau, A program to compute this sequence (SWI-Prolog)

Crossrefs

Cf. A323710.