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A135479 Sorted list of primitive strings that can be obtained by starting with 123 and repeatedly doubling any substring in place. 3
123, 12123, 12323, 123123, 1212123, 1212323, 1232323, 12123123, 12312123, 12312323, 12313123, 12323123, 121212123, 121212323, 121232123, 121232323, 123123123, 123212323, 123232323, 1212123123, 1212312123, 1212312323, 1212313123, 1212323123, 1231212123 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The list contains A135017(n) strings of length n.

The subset of strings in A135475 that contain no repeated symbol.

LINKS

Alois P. Heinz, Table of n, a(n) for n = 1..11498

Index entries for doubling substrings

CROSSREFS

Sequence in context: A297754 A068239 A098683 * A095761 A121917 A049670

Adjacent sequences:  A135476 A135477 A135478 * A135480 A135481 A135482

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Feb 22 2008

STATUS

approved

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Last modified November 18 13:22 EST 2018. Contains 317306 sequences. (Running on oeis4.)