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A120486 Partial sums of A000188. 2
1, 2, 3, 5, 6, 7, 8, 10, 13, 14, 15, 17, 18, 19, 20, 24, 25, 28, 29, 31, 32, 33, 34, 36, 41, 42, 45, 47, 48, 49, 50, 54, 55, 56, 57, 63, 64, 65, 66, 68, 69, 70, 71, 73, 76, 77, 78, 82, 89, 94, 95, 97, 98, 101, 102, 104, 105, 106, 107, 109, 110, 111, 114, 122, 123, 124, 125, 127, 128 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

This sequence can also be described as the number of 3-term non-decreasing geometric progressions with no term exceeding n.

REFERENCES

Gerry Myerson, Trifectas in Geometric Progression, Australian Mathematical Society Gazette, 2008, to appear.

CROSSREFS

Cf. A000188, A132188, A132189.

Sequence in context: A028790 A028748 A028783 * A025501 A028758 A028803

Adjacent sequences:  A120483 A120484 A120485 * A120487 A120488 A120489

KEYWORD

nonn

AUTHOR

Gerry Myerson (gerry(AT)ics.mq.edu.au), Nov 21 2007

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Last modified February 15 21:56 EST 2012. Contains 205860 sequences.