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A100996 a(1) = 1; a(n) is smallest positive integer such that a(n)*a(n-1)+1 is coprime to n. 0
1, 2, 2, 1, 1, 4, 1, 2, 2, 1, 1, 4, 1, 2, 3, 2, 1, 4, 1, 2, 2, 1, 1, 4, 2, 1, 1, 2, 1, 6, 1, 2, 2, 1, 1, 4, 1, 2, 2, 1, 1, 4, 1, 2, 3, 2, 1, 4, 1, 2, 2, 1, 1, 4, 2, 1, 1, 2, 1, 6, 1, 2, 2, 1, 1, 4, 1, 2, 2, 1, 1, 4, 1, 2, 3, 2, 1, 4, 1, 2, 2, 1, 1, 4, 2, 1, 1, 2, 1, 6, 3, 2, 2, 1, 1, 4, 1, 2, 2, 1, 1, 4, 1, 2, 5 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

MATHEMATICA

a[1] = 1; a[n_] := a[n] = Block[{k = 1}, While[ GCD[k*a[n - 1] + 1, n] != 1, k++ ]; k]; Table[ a[n], {n, 105}]

CROSSREFS

Sequence in context: A033151 A046079 A165509 * A090048 A064285 A006694

Adjacent sequences:  A100993 A100994 A100995 * A100997 A100998 A100999

KEYWORD

nonn

AUTHOR

Leroy Quet Jan 13 2005

EXTENSIONS

More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 11 2005

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Last modified February 14 04:02 EST 2012. Contains 205570 sequences.