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A005049 Minimal span of set of n elements with no 5-term arithmetic progression. 3
5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18, 23, 24, 26, 27, 28, 30, 32, 33, 35, 36, 37, 38, 40, 41, 42, 43, 48, 50, 51, 53, 55, 56, 57, 58, 60, 61, 62, 63, 65, 66, 67, 68, 75, 76, 77, 78, 80, 81, 82, 83, 85, 86, 87, 88, 90, 91, 92, 93, 104, 108, 112 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,1

COMMENTS

If the first appearance of n in A003004 is A003004(k) = n, then a(n) = k-1. - Fausto A. C. Cariboni, Jun 17 2018

LINKS

Table of n, a(n) for n=5..67.

B. E. Brown and D. M. Gordon, On sequences without geometric progressions, Math. Comp. 65 (1996), no. 216, 1749-1754.

Sean A. Irvine, Example sets for a(5)-a(34)

CROSSREFS

Cf. A005047, A005048, A005050.

Sequence in context: A088721 A288857 A201472 * A128427 A292917 A120182

Adjacent sequences:  A005046 A005047 A005048 * A005050 A005051 A005052

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from David W. Wilson, May 15 1997

a(24)-a(34) from Sean A. Irvine, Mar 16 2016

a(33) corrected by Fausto A. C. Cariboni, Jun 17 2018

a(35)-a(67) from Fausto A. C. Cariboni, Jun 17 2018

STATUS

approved

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Last modified April 23 13:25 EDT 2019. Contains 322386 sequences. (Running on oeis4.)