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

1,3

Comments

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

Links

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

Example

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.

Crossrefs

Sequence in context: A016450 A179397 A111272 * A091043 A321118 A167790

Adjacent sequences: A124689 A124690 A124691 * A124693 A124694 A124695

Keyword

base,easy,nonn

Author

Cino Hilliard, Dec 25 2006, corrected Jun 26 2007

Extensions

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

Status

approved