A135415 Van der Waerden numbers for 3-arithmetic progressions with n colors.

3, 9, 27, 76

Offset

1,1

Comments

It is known that a(5) > 170.

Links

Table of n, a(n) for n=1..4.

Eric Weisstein's World of Mathematics, Van der Waerden numbers

Wikipedia, Van der Waerden number

Crossrefs

Cf. A005346.

Sequence in context: A269684 A330079 A361423 * A182897 A228734 A048481

Adjacent sequences: A135412 A135413 A135414 * A135416 A135417 A135418

Keyword

nonn,hard,more

Author

Hunter Monroe (hmonroe(AT)huntermonroe.com), Feb 17 2008

Extensions

a(1) prepended by Jinyuan Wang, Mar 13 2020

Status

approved