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A005047 Minimal span of set of n elements with no 3-term arithmetic progression. 10
3, 4, 8, 10, 12, 13, 19, 23, 25, 29, 31, 35, 39, 40, 50, 53, 57, 62, 70, 73, 81, 83, 91, 94, 99, 103, 110, 113, 120, 121, 136, 144, 149, 156, 162, 164, 168, 173, 193 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

REFERENCES

R. K. Guy, Unsolved Problems in Number Theory, E10 (but beware of errors).

LINKS

Table of n, a(n) for n=3..41.

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

Index entries related to non-averaging sequences

EXAMPLE

Example for a(10) = 23: 0 1 4 6 10 15 17 18 22 23.

CROSSREFS

a(n) = A065825(n) - 1.

Sequence in context: A191193 A047343 A155730 * A083317 A268514 A024514

Adjacent sequences:  A005044 A005045 A005046 * A005048 A005049 A005050

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane.

EXTENSIONS

a(18)-a(41) derived from A065825 by Rob Pratt, Jul 09 2015

STATUS

approved

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Last modified October 20 23:39 EDT 2018. Contains 316405 sequences. (Running on oeis4.)