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A157605 a(2)=1. a(n) = the largest integer coprime to a(n-1) and less than the n-th Fibonacci number. 2
1, 1, 2, 3, 7, 12, 19, 33, 53, 88, 141, 232, 375, 608, 985, 1596, 2581, 4180, 6763, 10945, 17709, 28655, 46367, 75024, 121391, 196417, 317809, 514228, 832037, 1346268, 2178307, 3524577, 5702885, 9227464, 14930349, 24157816, 39088167, 63245984 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,3

LINKS

Table of n, a(n) for n=2..39.

MATHEMATICA

a[n_] := a[n] = Block[{k = Fibonacci@n - 1}, While[ GCD[k, a[n - 1]] > 1, k-- ]; k]; a[1] = a[2] = 1; Table[ a[n], {n, 2, 40}] (* Robert G. Wilson v, May 04 2009 *)

CROSSREFS

Cf. A157420, A157604, A157606.

Sequence in context: A121430 A217379 A023606 * A056179 A222196 A184696

Adjacent sequences:  A157602 A157603 A157604 * A157606 A157607 A157608

KEYWORD

nonn

AUTHOR

Leroy Quet, Mar 02 2009

EXTENSIONS

More terms from Robert G. Wilson v, May 04 2009

STATUS

approved

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Last modified May 18 14:41 EDT 2022. Contains 353816 sequences. (Running on oeis4.)