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A280468 Length of shortest prefix of the Möbius sequence (A008683) containing all possible length-n blocks that appear. 1
4, 16, 187, 245, 1326, 22025, 217076, 2214752, 25047853, 282144055, 694855331 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

For n = 2 the first 16 terms of the Möbius sequence are (1,-1,-1,0,-1,1,-1,0,0,1,-1,0,-1,1,1,0) which contains all 9 possible length-2 blocks; no shorter prefix does.

CROSSREFS

Cf. A008683.

Cf. A280466, which gives the number of distinct length-n blocks.

Sequence in context: A308239 A012916 A012921 * A224802 A000513 A088027

Adjacent sequences:  A280465 A280466 A280467 * A280469 A280470 A280471

KEYWORD

nonn,more

AUTHOR

Jeffrey Shallit, Jan 03 2017

STATUS

approved

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Last modified September 21 16:31 EDT 2021. Contains 347598 sequences. (Running on oeis4.)