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A058345 a(1) = 1; a(n+1) = lcm(Sum_{k=1..n} a(k), Product_{k=1..n} a(k)). 2
1, 1, 2, 4, 8, 64, 20480, 21558722560, 1896327099254067272089600 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 1..13
EXAMPLE
a(6) = lcm(1 + 1 + 2 + 4 + 8, 1*1*2*4*8) = lcm(16, 64) = 64.
MATHEMATICA
Nest[Append[#, LCM[Total@ #, Times @@ #]] &, {1}, 13] (* Michael De Vlieger, Dec 11 2017 *)
PROG
(Haskell)
a058345 n = a058345_list !! (n-1)
a058345_list = 1 : f 1 1 where
f u v = w : f (u * w) (v + w) where w = lcm u v
-- Reinhard Zumkeller, Mar 20 2014
CROSSREFS
Cf. A057194.
Sequence in context: A320898 A068994 A167182 * A093843 A270372 A018507
KEYWORD
nonn
AUTHOR
Leroy Quet, Dec 14 2000
STATUS
approved

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Last modified February 21 08:45 EST 2024. Contains 370228 sequences. (Running on oeis4.)