A139318 a(n) = (A139317(n)-1)/n.

1, 1, 2, 1, 2, 2, 4, 2, 2, 3, 2, 3, 4, 3, 4, 6, 6, 4, 10, 2, 6, 3, 2, 8, 4, 3, 4, 4, 2, 5, 10, 8, 6, 4, 2, 5, 4, 6, 4, 6, 2, 5, 4, 2, 6, 3, 6, 7, 4, 5, 6, 6, 2, 3, 6, 5, 8, 4, 12, 7, 6, 6, 6, 7, 2, 6, 4, 6, 4, 7, 8, 6, 4, 3, 8, 10, 6, 7, 4, 5, 6, 9, 2, 8, 12, 5, 4, 4, 2, 6, 10, 5, 12, 7, 6, 6, 4, 9, 10, 7

Offset

1,3

Links

Table of n, a(n) for n=1..100.

Example

For A139317(7) we check: 7*1 +1= 8, which is not coprime to A139317(1)=2. 7*2 +1= 15, which is not coprime to either A139317(2)=3 or to A139317(4)=5. 7*3 +1 = 22, which is not coprime to either A139317(1)=2 or to A139317(5)=11. But 7*4+1 = 29, which is coprime to terms A139317(1) through A139317(6). So a(7) = 4.

Crossrefs

Cf. A139317, A139320.

Sequence in context: A225216 A161833 A294100 * A205779 A205551 A281130

Adjacent sequences: A139315 A139316 A139317 * A139319 A139320 A139321

Keyword

nonn

Author

Leroy Quet, Apr 13 2008

Extensions

More terms from Max Alekseyev, Apr 29 2011

Status

approved