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A133707 Denominator of a remarkable product. 2
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 5, 5, 1, 5, 5, 5, 1, 1, 5, 5, 1, 1, 1, 5, 1, 1, 1, 1, 5, 5, 5, 5, 5, 25, 25, 25 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,76

COMMENTS

There seems to be no other denominators than 1 or 5^k.

The first 5^k terms appear respectively at positions {76,101,1351,4476,7601,...}

LINKS

Olivier Gérard, Table of n, a(n) for n = 1..10001

FORMULA

a(n) = Product( (394-225 i+85 i^2 -15 i^3+i^4)/120, i=1..n-1 )

CROSSREFS

Sequence of numerators is in A133706.

Sequence in context: A196998 A232614 A254609 * A171372 A083945 A125563

Adjacent sequences:  A133704 A133705 A133706 * A133708 A133709 A133710

KEYWORD

nonn,frac

AUTHOR

Olivier Gérard, Sep 20, 2007

STATUS

approved

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Last modified January 27 04:57 EST 2020. Contains 331291 sequences. (Running on oeis4.)