A124692 Position of substring A032740(n) within the decimal expansion of 2^A032740(n).

1, 1, 3, 10, 2, 10, 5, 3, 11, 13, 2, 5, 20, 4, 3, 24, 19, 5, 17, 19, 35, 25, 53, 67, 60, 61, 33, 74, 18, 109, 17, 30, 117, 96, 66, 14, 57, 62, 97, 80, 25, 81, 38, 112, 143, 152, 2, 92, 122, 113, 129, 93, 20, 159, 138, 187, 26, 57, 35, 105, 158, 9, 50, 58, 198, 185, 182, 42, 17

Offset: 1

Author

Cino Hilliard, Dec 25 2006, corrected Jun 26 2007

Keywords

• base
• easy
• nonn

Comments

A032740 includes numbers n that are a substring of 2^n.

Examples

			A032740(1) = 6 is a substring of 64 = 2^6 starting at position 1, so a(1) = 1.
A032740(2) = 10 is a substring of 1024 = 2^10 starting at position 1, so a(2) = 1.
A032740(3) = 36 is a substring of 68719476736 = 2^36 starting at position 10, so a(3) = 10.
		

Links

• David W. Wilson, Table of n, a(n) for n = 1..10000

Extensions

Edited by N. J. A. Sloane at the suggestion of Andrew S. Plewe, Jun 23 2007