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 A217005 Van der Waerden numbers w(j+2; t_0,t_1,...,t_{j-1}, 3, 3) with t_0 = t_1 = ... = t_{j-1} = 2. 7
 9, 14, 17, 20, 21, 24, 25, 28, 31, 33, 35, 37, 39, 42, 44, 46, 48, 50, 51 (list; graph; refs; listen; history; text; internal format)
 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 Table of n, a(n) for n=0..18. T. Ahmed, Some new van der Waerden numbers and some van der Waerden-type numbers, Integers, 9 (2009), A06, 65-76. 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(2;3,3)=9, w(3;2,3,3)=14, w(4;2,2,3,3)=17, and so on... CROSSREFS Cf. A171081, A217007, A217008, A217058, A217059, A217060, A217236, A217237. Sequence in context: A180868 A036266 A087722 * A103409 A011767 A305092 Adjacent sequences: A217002 A217003 A217004 * A217006 A217007 A217008 KEYWORD nonn,more,hard AUTHOR Tanbir Ahmed, Sep 22 2012 EXTENSIONS a(17)=50 and a(18)=51 added by Tanbir Ahmed, Dec 07 2012 STATUS approved

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Last modified July 22 12:22 EDT 2024. Contains 374499 sequences. (Running on oeis4.)