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A208448 Greatest common divisors of consecutive floor-factorial numbers (A010786). 4

%I #11 Feb 03 2022 09:31:22

%S 1,1,1,2,2,6,2,8,24,60,12,288,96,84,60,3840,384,15552,576,14400,20160,

%T 221760,576,331776,552960,224640,51840,20321280,2903040,108864000,

%U 345600,17694720,145981440,51701760,1935360,11287019520,1254113280,2978519040,10782720

%N Greatest common divisors of consecutive floor-factorial numbers (A010786).

%H Reinhard Zumkeller, <a href="/A208448/b208448.txt">Table of n, a(n) for n = 1..1000</a>

%F a(n) = GCD(A010786(n+1),A010786(n)).

%o (Haskell)

%o a208448 n = a208448_list !! (n-1)

%o a208448_list = zipWith gcd a010786_list $ tail a010786_list

%o (PARI) f(n) = prod(k=1, n, n\k); \\ A010786

%o a(n) = gcd(f(n+1), f(n)); \\ _Michel Marcus_, Feb 03 2022

%Y Cf. A010786, A208449, A208450.

%K nonn

%O 1,4

%A _Reinhard Zumkeller_, Feb 26 2012

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Last modified September 5 03:34 EDT 2024. Contains 375686 sequences. (Running on oeis4.)