A049064 Describe the previous term in binary (method A - initial term is 0).

0, 10, 1110, 11110, 100110, 1110010110, 111100111010110, 100110011110111010110, 1110010110010011011110111010110, 1111001110101100111001011010011011110111010110, 1001100111101110101100111100111010110111001011010011011110111010110

Offset: 1

Author

Olivier de Mouzon

Keywords

• base
• easy
• nice
• nonn

Comments

Method A = 'frequency' (in binary mode) followed by 'digit'-indication.

The number of digits of a(n) is A001609(n) except for n = 2. See the link from T. Sillke below. - Jianing Song, Mar 16 2019

Examples

			E.g., the term after 11110 is obtained by saying "four (i.e., 100 in binary mode) 1, one 0", which gives 100110.
		

Links

• Kade Robertson, Table of n, a(n) for n = 1..18
• Kade Robertson, Table of n, a(n) for n = 1..31
• T. Sillke, The binary form of Conway's sequence

Crossrefs

Cf. A001387 (initial term is 1), A001391, A001609 (number of digits), A259710 (written in decimal).

Decimal look-and-say sequences: A005150, A006751, A006715, A001140, A001141, A001143, A001145, A001151, A001154.

Formula

a(n) = A001391(n-1), n > 1. - R. J. Mathar, Oct 15 2008

Extensions

Edited by Charles R Greathouse IV, Apr 06 2010

a(11) from Kade Robertson, Jun 24 2015

Offset corrected by Jianing Song, Mar 16 2019