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A217059
Van der Waerden numbers w(j+2; t_0,t_1,...,t_{j-1}, 3, 5) with t_0 = t_1 = ... = t_{j-1} = 2.
7
22, 32, 43, 44, 50, 55, 61, 65, 70
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, On computation of exact van der Waerden numbers, Integers: Electronic Journal of Combinatorial Number Theory, 11 (2011), A71.
T. Ahmed, Some more Van der Waerden numbers, J. Int. Seq. 16 (2013) 13.4.4
EXAMPLE
w(2;3,5)=22, w(3;2,3,5)=32, w(4;2,2,3,5)=43, and so on...
KEYWORD
nonn,more,hard
AUTHOR
Tanbir Ahmed, Sep 25 2012
EXTENSIONS
a(8) = 70 from Tanbir Ahmed, Mar 11 2013
STATUS
approved