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A189102
Greatest common divisor of n! and its arithmetic derivative.
3
1, 1, 1, 4, 4, 48, 48, 192, 1728, 34560, 34560, 414720, 414720, 2903040, 130636800, 2090188800, 2090188800, 25082265600, 25082265600, 501645312000, 31603654656000, 347640201216000, 347640201216000, 5562243219456000, 139056080486400000
OFFSET
1,4
LINKS
FORMULA
a(n) = gcd(n!,n!') = gcd(A000142(n),A068311(n)).
EXAMPLE
n = 5: 5! = 120, 120' = 244, gcd(120,244) = 4 -> a(5) = 4
KEYWORD
nonn
AUTHOR
Giorgio Balzarotti, Apr 16 2011
STATUS
approved