A087227 Number of distinct prime factors of A087226(n), the LCM of terms in trajectory of 3x+1 (function) initiated at n.

0, 1, 3, 1, 2, 3, 6, 1, 7, 2, 5, 3, 3, 6, 6, 1, 4, 7, 7, 2, 3, 5, 5, 3, 7, 3, 37, 6, 6, 6, 35, 1, 8, 4, 4, 7, 7, 7, 12, 2, 36, 3, 8, 5, 5, 5, 35, 3, 7, 7, 8, 3, 3, 37, 35, 6, 10, 6, 11, 6, 6, 35, 36, 1, 7, 8, 9, 4, 5, 4, 34, 7, 36, 7, 5, 7, 7, 12, 12, 2, 7, 36, 35, 3, 3, 8, 11, 5, 10, 5, 32, 5, 6, 35, 35

Offset: 1

Author

Labos Elemer, Aug 28 2003

Keywords

• nonn

Comments

This sequence differs from A078719: a(n) <= (number of odd terms in list).

Examples

			n=25: A087226(25) = 535792400 with factor-set={2,5,11,13,17,19,29} so a(25)=7, while number of odd terms in the trajectory is A078219(25)=8.
		

Crossrefs

Cf. A006370, A087226, A078719.