A081703 Largest proper divisor of the n-th Carmichael number (A002997).

187, 221, 247, 493, 403, 943, 1273, 2117, 2263, 2257, 5863, 3589, 7519, 20915, 9139, 6851, 14443, 8917, 18031, 9553, 24583, 26923, 6161, 55709, 7957, 24217, 17587, 26197, 12871, 10001, 89813, 13213, 16531, 40837, 42517, 218867, 59891, 95719

Offset

1,1

Links

Robert Israel, Table of n, a(n) for n = 1..10000

J. Perry, Carmichael factors

Formula

a(n) = A032742(A002997(n)) - David Wasserman, Jun 18 2004

a(n) = A002997(n)/A141710(n). - Robert Israel, Apr 13 2017

Example

The first Carmichael number is 3*11*17, so a(1) = 11*17.

Maple

seq(A002997[n]/min(numtheory:-factorset(A002997[n])), n=1..100); # Robert Israel, Apr 13 2017

Crossrefs

Cf. A002997, A032742, A141710.

Sequence in context: A155544 A221974 A227869 * A166391 A339863 A349939

Adjacent sequences: A081700 A081701 A081702 * A081704 A081705 A081706

Keyword

nonn

Author

Lekraj Beedassy, Apr 02 2003

Extensions

More terms from David Wasserman, Jun 18 2004

Status

approved