A079274 Number of divisors associated with the cyclic cases within the n-th group of least prime signatures.

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

Offset: 0

Author

Alford Arnold, Feb 06 2003

Keywords

• easy
• nonn

Examples

			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...
		

Crossrefs

Cf. A074141.

Formula

a(n) = A074141(n) - 2* A074141(n-1) for n > 0 and a(0) = 1

Extensions

More terms from Pab Ter (pabrlos(AT)yahoo.com), May 27 2004