A132588 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)). Then a(n) = gcd(b(n), n).

1, 1, 1, 1, 1, 1, 1, 4, 1, 5, 1, 2, 1, 2, 1, 1, 1, 2, 1, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 15, 1, 1, 4, 1, 2, 1, 1, 1, 2, 1, 2, 3, 2, 1, 1, 1, 2, 1, 1, 5, 2, 1, 1, 1, 7, 1, 2, 1, 2, 1, 1, 1, 2, 1, 4, 3, 2, 1, 12, 1, 1

Offset: 1

Author

Leroy Quet, Aug 23 2007

Keywords

• nonn

Examples

			A027750: 1,1,2,1,3,1,2,4,1,5,1,2,3,6,...
The 14th term of this list is 6.
So a(14) = GCD(6,14) = 2.
		

Links

• Rémy Sigrist, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A132587, A132589, A027750.

Programs

PARI

for (m=1, oo, fordiv (m, d, print1 (gcd(d, n++) ", "); if (n==86, break (2)))) \\ Rémy Sigrist, Feb 06 2019

Extensions

More terms from Rémy Sigrist, Feb 06 2019