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A225745 Smallest k such that n numbers can be picked in {1,...,k} with no four in arithmetic progression. 0
1, 2, 3, 5, 6, 8, 9, 10, 13, 15, 17, 19, 21, 23, 25, 27, 28, 30, 33, 34, 37, 40, 43, 45, 48, 50, 53, 54, 58, 60, 64, 66, 68, 70, 74, 77 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..36.

Samuel S. Wagstaff, Jr., On k-free sequences of integers, Math. Comp., 26 (1972), 767-771.

EXAMPLE

a(8)=10 because of the unique solution 1 2 3 5 6 8 9 10.

CROSSREFS

This sequence is to A003003 as A065825 is to A003002.

Sequence in context: A288373 A087067 A166018 * A238896 A190842 A273106

Adjacent sequences:  A225742 A225743 A225744 * A225746 A225747 A225748

KEYWORD

nonn,more

AUTHOR

Don Knuth, Aug 05 2013

STATUS

approved

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Last modified June 25 20:26 EDT 2017. Contains 288730 sequences.