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A058189
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Number of increasing geometric progressions ending in n (in the positive integers), including those of length 1 or 2.
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1
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1, 2, 3, 5, 5, 6, 7, 10, 11, 10, 11, 13, 13, 14, 15, 21, 17, 20, 19, 21, 21, 22, 23, 26, 29, 26, 31, 29, 29, 30, 31, 38, 33, 34, 35, 41, 37, 38, 39, 42, 41, 42, 43, 45, 47, 46, 47, 53, 55, 54, 51, 53, 53, 58, 55, 58, 57, 58, 59, 61, 61, 62, 65, 77, 65, 66, 67, 69, 69, 70, 71
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| a(n) =A058190(n)+n
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EXAMPLE
| a(4)=5 since the possibilities are (4), (1,4), (2,4), (3,4) and (1,2,4).
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CROSSREFS
| Cf. A054519 for arithmetic progressions.
Sequence in context: A067535 A076752 A079114 * A069208 A066113 A163831
Adjacent sequences: A058186 A058187 A058188 * A058190 A058191 A058192
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KEYWORD
| nonn
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AUTHOR
| Henry Bottomley (se16(AT)btinternet.com), Nov 22 2000
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