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A217008
Van der Waerden numbers w(j+3; t_0,t_1,...,t_{j-1}, 3, 3, 3) with t_0 = t_1 = ... = t_{j-1} = 2.
7
27, 40, 41, 42, 45, 49, 52
OFFSET
0,1
REFERENCES
T. C. Brown, Some new van der Waerden numbers (preliminary report), Notices American Math. Society, 21 (1974), A-432.
V. Chvatal, Some unknown van der Waerden numbers, Combinatorial Structures and their Applications (R. Guy et al., eds.), Gordon and Breach, New York, 1970.
LINKS
T. Ahmed, Some more Van der Waerden numbers, J. Int. Seq. 16 (2013) 13.4.4
B. Landman, A. Robertson, and C. Culver, Some new exact van der Waerden numbers, Integers, 5(2) (2005), A10.
EXAMPLE
w(3;3,3,3)=27, w(4;2,3,3,3)=40, w(5;2,2,3,3,3)=41, and so on...
KEYWORD
nonn,more,hard
AUTHOR
Tanbir Ahmed, Sep 23 2012
EXTENSIONS
a(6)=52 added by Tanbir Ahmed, Dec 07 2012
STATUS
approved