A280468 Length of shortest prefix of the Möbius sequence (A008683) containing all possible length-n blocks that appear.

4, 16, 187, 245, 1326, 22025, 217076, 2214752, 25047853, 282144055, 694855331

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