A135475 Sorted list of strings that can be obtained by starting with 123 and repeatedly doubling any substring in place.

123, 1123, 1223, 1233, 11123, 11223, 11233, 12123, 12223, 12233, 12323, 12333, 111123, 111223, 111233, 112123, 112223, 112233, 112323, 112333, 121123, 121223, 121233, 122123, 122223, 122233, 122323, 122333, 123123, 123223, 123233, 123323, 123333, 1111123

Offset

1,1

Comments

The list contains A135473(n) strings of length n.

Links

Alois P. Heinz, Table of n, a(n) for n = 1..10397 (strings with length <= 12)

Index entries for doubling substrings

Crossrefs

Cf. A135473, A130838, A135479, A135017.

Sequence in context: A193251 A074303 A077379 * A233119 A167231 A174173

Adjacent sequences: A135472 A135473 A135474 * A135476 A135477 A135478

Keyword

nonn,easy

Author

N. J. A. Sloane, Feb 22 2008, Mar 16 2008

Status

approved