id:A051271 - OEIS Search Results

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Number of numbers either relatively prime to or divisors of primorial number(n).

+0
2

3, 6, 16, 64, 512, 5824, 92288, 1659136, 36495872, 1021871104, 30656104448, 1103619690496, 44144787464192, 1854081073168384, 85287729365024768, 4434961926979649536, 257227791764816003072, 15433667505888952582144 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`A000005[ A002110[ n ] ] + A000005[ A002110[ n ] ]; complementary to A045763[ A002110 ] ].`
	EXAMPLE	`The 4th primorial (210) has 16 divisors and 48 coprimes, so a(4)=16+48=64.`
	CROSSREFS	`A000005, A000010, A002110, A045763, A051272.` `Sequence in context: A113040 A007002 A107885 this_sequence A028405 A014645 A036050` `Adjacent sequences: A051268 A051269 A051270 this_sequence A051272 A051273 A051274`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu)`

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.

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