login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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 (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..8.

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;3,5)=22, w(3;2,3,5)=32, w(4;2,2,3,5)=43, and so on...

CROSSREFS

Cf. A217005, A217007, A217008, A217058, A217060, A217236, A217237.

Sequence in context: A106555 A106557 A142347 * A121019 A167337 A216798

Adjacent sequences:  A217056 A217057 A217058 * A217060 A217061 A217062

KEYWORD

nonn,more,hard

AUTHOR

Tanbir Ahmed, Sep 25 2012

EXTENSIONS

a(8) = 70 from Tanbir Ahmed, Mar 11 2013

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 16 08:07 EST 2017. Contains 296076 sequences.