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A051272 Number of numbers neither relatively prime to nor divisors of primorial number(n). 1
0, 1, 15, 147, 1799, 24207, 418223, 8040555, 186596999, 5447822127, 169904385683, 6317118444315, 260105476063019, 11228680258501647, 529602053223466643, 28154196550210395195, 1665532558389396635999 (list; graph; refs; listen; history; internal format)
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: A025440 A155638 A069417 * A021414 A055431 A119998

Adjacent sequences:  A051269 A051270 A051271 * A051273 A051274 A051275

KEYWORD

nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu)

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Last modified February 16 21:51 EST 2012. Contains 205978 sequences.