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A005050 Minimal span of set of n elements with no 6-term arithmetic progression. 4
6, 7, 8, 9, 11, 12, 13, 14, 16, 17, 18, 19, 21, 22, 23, 24, 25, 28, 31, 32, 34, 35, 36, 38, 39, 40, 43, 44, 45, 47, 48, 49, 50, 53, 55, 57, 58, 60, 61, 63, 64, 65, 67, 69, 70, 72, 73, 74, 75, 79, 81, 82, 84, 85, 87, 88, 90, 92, 93, 94, 95, 97, 98, 99, 100, 104 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,1

COMMENTS

If the first appearance of n in A003005 is A003005(k) = n, then a(n) = k-1. - Fausto A. C. Cariboni, Jun 17 2018

LINKS

Fausto A. C. Cariboni, Table of n, a(n) for n = 6..95

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(6)-a(38)

CROSSREFS

Cf. A005047, A005048, A005049.

Sequence in context: A108613 A081408 A143616 * A120191 A059983 A177106

Adjacent sequences:  A005047 A005048 A005049 * A005051 A005052 A005053

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from David W. Wilson, May 15 1997

a(25)-a(38) from Sean A. Irvine, Mar 17 2016

a(39)-a(71) from Fausto A. C. Cariboni, Jun 17 2018

STATUS

approved

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Last modified November 20 08:16 EST 2018. Contains 317385 sequences. (Running on oeis4.)