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A018835 Minimal number of smaller integer-sided squares that tile an n X n square. 3
4, 6, 4, 8, 4, 9, 4, 6, 4, 11, 4, 11, 4, 6, 4, 12, 4, 13, 4, 6, 4, 13, 4, 8, 4, 6, 4, 14, 4, 15, 4, 6, 4, 8, 4, 15, 4, 6, 4, 15, 4, 16, 4, 6, 4, 16, 4, 9, 4, 6, 4, 16, 4, 8, 4, 6, 4, 17, 4, 17, 4, 6, 4, 8, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

COMMENTS

Sascha Kurz has found a(n) for n <= 104, and up to this point he observes that a(n) is given by a(n) = min{ a(p) | p prime, p divides n } (cf. A211302). - N. J. A. Sloane, Apr 07 2012

REFERENCES

S. Kurz, Squaring the square with integer linear programming, http://www.wm.uni-bayreuth.de/fileadmin/Sascha/Publikationen2/square.pdf

LINKS

Ed Wynn, Table of n, a(n) for n = 2..126

Ed Wynn, Exhaustive generation of Mrs Perkins's quilt square dissections for low orders, 2013; arXiv:1308.5420

CROSSREFS

Cf. A211302.

Sequence in context: A084892 A245556 A256318 * A055166 A202243 A130762

Adjacent sequences:  A018832 A018833 A018834 * A018836 A018837 A018838

KEYWORD

nonn,more

AUTHOR

David W. Wilson

EXTENSIONS

Extended by David W. Wilson, using values from A211302

b-file from Wynn, 2013, added by N. J. A. Sloane, Nov 29 2013

STATUS

approved

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Last modified December 17 06:45 EST 2018. Contains 318192 sequences. (Running on oeis4.)