id:A033683 - OEIS Search Results

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1 iff n is odd square not divisible by 3.

+0
2

0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`Multiplicative with a(p^e) = 1 if 2 divides e and p > 3, 0 otherwise. Mitch Harris (Harris.Mitchell(AT)mgh.harvard.edu) Jun 09, 2005.`
	REFERENCES	`J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 105, Eq. (41).`
	FORMULA	`Essentially the series psi_6(z)=(1/2)(theta_2(z/9)-theta_2(z)).` `Euler transform of period 144 sequence. - Michael Somos Jan 26 2008`
	EXAMPLE	`q + q^25 + q^49 + q^121 + q^169 + q^289 + q^361 + q^529 + q^625 + ...`
	PROGRAM	`(PARI) {a(n) = if( n%24 == 1, issquare(n), 0)} /* Michael Somos Jan 26 2008 */`
	CROSSREFS	`A080995(n) = a(24n+1).` `Sequence in context: A104121 A063524 A084928 this_sequence A130638 A030217 A030215` `Adjacent sequences: A033680 A033681 A033682 this_sequence A033684 A033685 A033686`
	KEYWORD	`nonn,mult`
	AUTHOR	`njas`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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