id:A118713 - OEIS Search Results

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a(n) = determinant of n X n circulant matrix whose first row is A001358(1), A001358(2), ..., A001358(n) where A001358(n) = n-th semiprime.

+0
8

4, -20, 361, -3567, 218053, -3455872, 736439027, -16245418225, 1519211613654 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Semiprime analogue of A066933 Circulant of prime numbers. a(n) alternates in sign. A048954 Wendt determinant of n-th circulant matrix C(n). A052182 Circulant of natural numbers. A086459 Circulant of powers of 2.`
	LINKS	`Eric Weisstein's World of Mathematics, Circulant Matrix.`
	EXAMPLE	`a(2) = -20 = determinant` `\|4,6\|` `\|6,4\|.` `a(3) = 361 = 19^2 = determinant` `\|4,6,9\|` `\|9,4,6\|` `\|6,9,4\|.`
	CROSSREFS	`Cf. A001358, A048954, A052182, A066933, A086459, A086569.` `Sequence in context: A120599 A012797 A054465 this_sequence A132511 A012841 A074195` `Adjacent sequences: A118710 A118711 A118712 this_sequence A118714 A118715 A118716`
	KEYWORD	`easy,sign`
	AUTHOR	`Jonathan Vos Post (jvospost2(AT)yahoo.com), May 20 2006`
	EXTENSIONS	`Edited by njas at the suggestion of Andrew Plewe, Aug 23 2007`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.