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 A217058 Van der Waerden numbers w(j+2; t_0,t_1,...,t_{j-1}, 3, 4) with t_0 = t_1 = ... = t_{j-1} = 2. 7
 18, 21, 25, 29, 33, 36, 40, 42, 45, 48, 52, 55 (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 T. Ahmed, Some new van der Waerden numbers and some van der Waerden-type numbers, Integers, 9 (2009), A06, 65-76. 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;3,4)=18, w(3;2,3,4)=21, w(4;2,2,3,4)=25, and so on... CROSSREFS Cf. A217005, A217007, A217008, A217059, A217060, A217236, A217237. Sequence in context: A303686 A185099 A216295 * A172052 A001101 A088341 Adjacent sequences:  A217055 A217056 A217057 * A217059 A217060 A217061 KEYWORD nonn,more,hard AUTHOR Tanbir Ahmed, Sep 25 2012 EXTENSIONS a(11)=55 added by Tanbir Ahmed, Dec 07 2012 STATUS approved

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Last modified December 6 21:48 EST 2019. Contains 329809 sequences. (Running on oeis4.)