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A058190
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Number of increasing geometric progressions ending in n (in the positive integers), excluding those of length 1 or 2.
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1
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0, 0, 0, 1, 0, 0, 0, 2, 2, 0, 0, 1, 0, 0, 0, 5, 0, 2, 0, 1, 0, 0, 0, 2, 4, 0, 4, 1, 0, 0, 0, 6, 0, 0, 0, 5, 0, 0, 0, 2, 0, 0, 0, 1, 2, 0, 0, 5, 6, 4, 0, 1, 0, 4, 0, 2, 0, 0, 0, 1, 0, 0, 2, 13, 0, 0, 0, 1, 0, 0, 0, 6, 0, 0, 4, 1, 0, 0, 0, 5, 12, 0, 0, 1, 0, 0, 0, 2, 0, 2, 0, 1, 0, 0, 0, 6, 0, 6, 2, 9, 0, 0, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,8
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FORMULA
| a(n) =A058189(n)-n
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EXAMPLE
| a(16)=5 since the possibilities are (1,4,16), (1,2,4,8,16), (2,4,8,16), (4,8,16), (9,12,16).
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CROSSREFS
| Sequence in context: A125096 A037862 A032337 * A055736 A006997 A141612
Adjacent sequences: A058187 A058188 A058189 * A058191 A058192 A058193
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KEYWORD
| nonn
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AUTHOR
| Henry Bottomley (se16(AT)btinternet.com), Nov 22 2000
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