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A098371 #{m: GCD(n,a(m)) = Max{GCD(n,a(k)): 1<=k<n}}. 3
1, 1, 2, 1, 4, 2, 6, 1, 1, 4, 10, 1, 12, 7, 1, 3, 16, 2, 18, 1, 1, 10, 22, 1, 2, 13, 1, 1, 28, 2, 30, 1, 1, 16, 2, 1, 36, 19, 1, 3, 40, 1, 42, 1, 1, 21, 46, 2, 4, 4, 9, 1, 52, 2, 1, 1, 1, 27, 58, 1, 60, 29, 2, 2, 2, 1, 66, 12, 1, 2, 70, 1, 72, 37, 2, 1, 2, 1, 78, 1, 1, 40, 82, 1, 7, 42, 2, 2, 88, 2, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

a(n) = n-1 iff n = 1 or n is prime;

a(A098373(n)) = n and a(m) <> n for m < A098373(n);

a(A098374(n)) = 1;

a(n) = #{m: GCD(n,a(m)) = A098372(n)}.

LINKS

Table of n, a(n) for n=1..91.

CROSSREFS

Cf. A096216, A000010.

Sequence in context: A217916 A057923 A147763 * A300234 A070777 A173614

Adjacent sequences:  A098368 A098369 A098370 * A098372 A098373 A098374

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Sep 05 2004

STATUS

approved

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Last modified July 17 14:44 EDT 2019. Contains 325106 sequences. (Running on oeis4.)