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A005047
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Minimal span of set of n elements with no 3-term A.P.
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1
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3, 4, 8, 10, 12, 13, 19, 23, 25, 29, 31, 35, 39, 40, 50
(list; graph; refs; listen; history; internal format)
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OFFSET
| 3,1
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REFERENCES
| B. E. Brown and D. M. Gordon, On sequences without geometric progressions, Math. Comp., 65 (1996), 1749-1754.
R. K. Guy, Unsolved Problems in Number Theory, E10 (but beware of errors).
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EXAMPLE
| Example for a(10) = 23: 0 1 4 6 10 15 17 18 22 23
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CROSSREFS
| Sequence in context: A191193 A047343 A155730 * A083317 A024514 A114913
Adjacent sequences: A005044 A005045 A005046 * A005048 A005049 A005050
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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