id:A051272 - OEIS Search Results

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Number of numbers neither relatively prime to nor divisors of primorial number(n).

+0
2

0, 1, 15, 147, 1799, 24207, 418223, 8040555, 186596999, 5447822127, 169904385683, 6317118444315, 260105476063019, 11228680258501647, 529602053223466643, 28154196550210395195, 1665532558389396635999 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`a(n)=A045763[ A002110[ n ] ] ].`
	EXAMPLE	`The 4th primorial (210) has 16 divisors and 48 coprimes, so a(4)=210-64+1=147`
	CROSSREFS	`A000005, A000010, A002110, A045763, A051271.` `Sequence in context: A026893 A025440 A069417 this_sequence A021414 A055431 A119998` `Adjacent sequences: A051269 A051270 A051271 this_sequence A051273 A051274 A051275`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu)`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research