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Search: id:A098371
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A098371 #{m: GCD(n,a(m)) = Max{GCD(n,a(k)): 1<=k<n}}. +0
4
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; listen)
OFFSET

1,3

COMMENT

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)}.

CROSSREFS

Cf. A096216, A000010.

Sequence in context: A161293 A057923 A147763 this_sequence A070777 A023900 A141564

Adjacent sequences: A098368 A098369 A098370 this_sequence A098372 A098373 A098374

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Sep 05 2004

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.


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