A139713 a(0)=1. For n >=1, a(n) = largest positive integer < a(n-1) that is not coprime to the n-th composite, if such an integer exists. Otherwise, a(n) = smallest integer > a(n-1) that is not coprime to the n-th composite.

1, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 5, 4, 3, 2, 3, 2, 3, 2, 5, 4, 2, 3, 2, 3, 2, 3, 2, 3, 7, 6, 3, 2, 3, 5, 4, 3, 2, 3, 2, 3, 2, 5, 4, 2, 3, 2, 3, 2, 3, 2, 7, 6, 5, 3, 2, 3, 5, 4, 3, 2, 3, 7, 6, 3, 2, 5, 4, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 5, 4, 3, 2, 7, 6, 11, 10, 9, 8, 5, 4, 2, 3, 2, 3, 7, 6, 5, 4

Offset

0,2

Links

Diana Mecum, Table of n, a(n) for n = 0..1199

Crossrefs

Cf. A139712, A002808.

Sequence in context: A356464 A010693 A158478 * A171465 A178620 A342866

Adjacent sequences: A139710 A139711 A139712 * A139714 A139715 A139716

Keyword

nonn

Author

Leroy Quet, Apr 30 2008

Extensions

More terms from Diana L. Mecum, Jul 24 2008

Status

approved