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A111119 Product{1<=k<=n,GCD(k,n)=1} F(k), where F(k) is the k-th Fibonacci number. 0
1, 1, 1, 2, 6, 5, 240, 130, 4095, 884, 122522400, 5785, 1570247078400, 7050580, 6402818331, 55911099400, 83044763560621070208000, 2152604285, 342696507457909818131702784000, 122400523811956, 16017296251646471425875 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

The positive integers <= 8 and coprime to 8 are 1,3,5,7. So a(8) = F(1)*F(3)*F(5)*F(7) = 1*2*5*13 = 130.

MATHEMATICA

f[n_] := Times @@ Fibonacci /@ Select[ Range[n], GCD[ #, n] == 1 &]; Array[f, 21] (* Robert G. Wilson v *)

CROSSREFS

Cf. A000045, A070964.

Sequence in context: A069113 A298329 A009462 * A107495 A019716 A106152

Adjacent sequences:  A111116 A111117 A111118 * A111120 A111121 A111122

KEYWORD

nonn

AUTHOR

Leroy Quet, Oct 15 2005

EXTENSIONS

More terms from Robert G. Wilson v, Oct 17 2005

STATUS

approved

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Last modified June 4 05:19 EDT 2020. Contains 334815 sequences. (Running on oeis4.)