id:A009530 - OEIS Search Results

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Expansion of sin(tanh(x)/cos(x)).

+0
3

1, 0, 12, -336, -2096, -1043328, -29488704, -8894706432, -389860902656, -170568226222080, -6327905330549760, -6080018829202427904, 242897035394043301888, -323994054628796940582912 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Among solutions to a[x]=2x are primes, twice primes [A001747], and also further numbers.`
	MATHEMATICA	`Sin[ Tanh[ x ]/Cos[ x ] ] (* Odd Part *)`
	CROSSREFS	`Adjacent sequences: A009527 A009528 A009529 this_sequence A009531 A009532 A009533` `Sequence in context: A083431 A080141 A110101 this_sequence A009680 A027015 A024297`
	KEYWORD	`sign`
	AUTHOR	`R. H. Hardin (rhh(AT)cadence.com)`
	EXTENSIONS	`Extended with signs Mar 15 1997 by Olivier Gerard.`

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Last modified October 10 20:39 EDT 2008. Contains 144831 sequences.

AT&T Labs Research