id:A014632 - OEIS Search Results

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Odd pentagonal numbers.

+0
3

1, 5, 35, 51, 117, 145, 247, 287, 425, 477, 651, 715, 925, 1001, 1247, 1335, 1617, 1717, 2035, 2147, 2501, 2625, 3015, 3151, 3577, 3725, 4187, 4347, 4845, 5017, 5551, 5735, 6305, 6501, 7107, 7315, 7957, 8177, 8855, 9087, 9801, 10045, 10795, 11051, 11837 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`Conjecture: a(n)= a(n-1) +2a(n-2) -2a(n-3) -a(n-4) +a(n-5). G.f.: -(1+4x+28x^2+8x^3+7x^4)/((1+x)^2*(x-1)^3). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 25 2009]`
	CROSSREFS	`Sequence in context: A095865 A087675 A128044 this_sequence A117985 A115707 A117793` `Adjacent sequences: A014629 A014630 A014631 this_sequence A014633 A014634 A014635`
	KEYWORD	`nonn`
	AUTHOR	`Mohammad K. Azarian (ma3(AT)evansville.edu)`
	EXTENSIONS	`More terms from Patrick De Geest (pdg(AT)worldofnumbers.com)`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

AT&T Labs Research