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A132587
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Let b(k) be the k-th term of the flattened irregular array where the m-th row contains the positive divisors of m. (b(k) = A027750(k).) Let c(k) be the k-th term of the flattened irregular array where the m-th row contains the positive integers that are <= m and are coprime to m. (c(k) = A038566(k).) Then a(n) = GCD(b(n),c(n)).
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2
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1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 5, 1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,8
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EXAMPLE
| A027750: 1,1,2,1,3,1,2,4,1,5,1,2,3,6,...
A038566: 1,1,1,2,1,3,1,2,3,4,1,5,1,2,...
The 14th terms of each list are 6 and 2.
So a(14) = GCD(6,2) = 2.
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CROSSREFS
| Cf. A132588, A132589, A027750, A038566.
Sequence in context: A108775 A074971 A198067 * A204697 A008651 A049107
Adjacent sequences: A132584 A132585 A132586 * A132588 A132589 A132590
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KEYWORD
| more,nonn
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AUTHOR
| Leroy Quet, Aug 23 2007
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