id:A048980 - OEIS Search Results

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Difference between number of nonprimes and primes in reduced residue system of primorial numbers.

+0
1

1, 0, -6, -36, -196, -724, 7512, 366838, 11928316, 421130508, 14598816402, 584642184936, 25314953837836 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`a(n) = A048863(A002110(n)) - A048862(A002110(n)) = A048866(A002110(n))`
	EXAMPLE	`n=4, Q(4)=235*7=210, reduced residue system includes 48 terms:42 primes and 6 composites and 1: a(4)=6-42=-36.`
	CROSSREFS	`Cf. A048868, A048867, A048597, A002110, A048862, A048863, A048866.` `Sequence in context: A132165 A074444 A106539 this_sequence A055299 A000551 A038157` `Adjacent sequences: A048977 A048978 A048979 this_sequence A048981 A048982 A048983`
	KEYWORD	`sign`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu)`

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Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.