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A079274
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Number of divisors associated with the cyclic cases within the n-th group of least prime signatures.
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1
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1, 0, 3, 4, 14, 18, 65, 82, 253, 378, 953, 1460, 3667, 5480, 12917, 20582, 45130, 71970, 156510, 248020, 524446, 846962, 1733252, 2806484, 5702101, 9186010, 18375867, 29872508, 58760991, 95500008, 186871472, 302966474, 587603027, 956192230
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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FORMULA
| a(n) = A074141(n) - 2* A074141(n-1) for n > 0 and a(0) = 1
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EXAMPLE
| The number of divisors doubles each time we create a new "matching" partition by appending "1" to a given partition. Therefore we may write
..1..0..3..4..14..18..65..82..253..378..953...
+ ...2..4.14..36.100.236.602.1368.3242.7240...
= 1..2..7.18..50.118.301.684.1621.3620.8193...
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CROSSREFS
| Cf. A074141.
Sequence in context: A082732 A009286 A076663 * A024863 A025107 A047182
Adjacent sequences: A079271 A079272 A079273 * A079275 A079276 A079277
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KEYWORD
| easy,nonn
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AUTHOR
| Alford Arnold (Arnold1940(AT)aol.com), Feb 06 2003
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EXTENSIONS
| More terms from Pab Ter (pabrlos(AT)yahoo.com), May 27 2004
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