id:A005094 - OEIS Search Results

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Number of prime divisors = 1 mod 4 of n minus number of prime divisors = 3 mod 4 of n.

+0
1

0, 0, -1, 0, 1, -1, -1, 0, -1, 1, -1, -1, 1, -1, 0, 0, 1, -1, -1, 1, -2, -1, -1, -1, 1, 1, -1, -1, 1, 0, -1, 0, -2, 1, 0, -1, 1, -1, 0, 1, 1, -2, -1, -1, 0, -1, -1, -1, -1, 1, 0, 1, 1, -1, 0, -1, -2, 1, -1, 0, 1, -1, -2, 0, 2, -2, -1, 1, -2, 0, -1, -1, 1, 1, 0, -1, -2, 0, -1, 1, -1 (list; graph; listen)

	OFFSET	`1,21`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..10000`
	FORMULA	`Additive with a(p^e) = 0 if p = 2, 1 if p = 1 (mod 4), -1 if p = 3 (mod 4).`
	CROSSREFS	`Sequence in context: A037911 A037912 A056980 this_sequence A121372 A123706 A025452` `Adjacent sequences: A005091 A005092 A005093 this_sequence A005095 A005096 A005097`
	KEYWORD	`sign`
	AUTHOR	`njas`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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