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A008341 a(n)=1, a(n+1) = lcm(a(n),b(n)) / gcd(a(n),b(n)), where {b(n)} = {fibonacci(n)}. 2
1, 1, 1, 2, 6, 30, 60, 780, 1820, 15470, 34034, 3029026, 109044936, 25407470088, 56678202504, 8643425881860, 19344810307020, 30893662060310940, 17264105268997290, 72181224129677669490 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..20.

MAPLE

with(combinat): A008341 := proc(n) option remember; if n = 1 then 1 else lcm(A008341(n-1), fibonacci(n-1))/gcd(A008341(n-1), fibonacci(n-1)); fi; end;

MATHEMATICA

FoldList[ LCM[ #1, #2 ]/GCD[ #1, #2 ]&, 1, Nest[ Join[ #1, {Plus@@Take[ #1, -2 ]} ]&, {1, 1}, 20 ] ]

CROSSREFS

Sequence in context: A298759 A127517 A137825 * A211889 A174276 A117849

Adjacent sequences:  A008338 A008339 A008340 * A008342 A008343 A008344

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

Mathematica Program Aug 15 1997 (Olivier Gérard).

STATUS

approved

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Last modified June 13 11:17 EDT 2021. Contains 344990 sequences. (Running on oeis4.)