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

%I #16 Feb 21 2021 06:03:51

%S 3,9,27,76

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

%C It is known that a(5) > 170.

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/vanderWaerdenNumber.html">Van der Waerden numbers</a>

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Van_der_Waerden_number">Van der Waerden number</a>

%Y Cf. A005346.

%K nonn,hard,more

%O 1,1

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

%E a(1) prepended by _Jinyuan Wang_, Mar 13 2020