A112631 Rightmost term of each row of triangle A112599. (For n >= 2, a(n) = number of terms in the (n-1)th row of triangle A112599 which are coprime to n.)

1, 1, 2, 0, 2, 0, 3, 5, 7, 5, 10, 4, 12, 9, 6, 5, 16, 3, 18, 2, 17, 5, 22, 8, 22, 12, 13, 8, 28, 5, 30, 5, 30, 15, 22, 9, 36, 23, 18, 16, 40, 2, 42, 15, 20, 9, 46, 20, 46, 12, 23, 21, 52, 10, 33, 26, 40, 27, 58, 21, 60, 23, 41, 31, 55, 11, 66, 32, 44, 21, 70, 19, 72, 23, 40, 28, 63, 17

Offset: 1

Author

Leroy Quet, Dec 22 2005

Keywords

• nonn

Comments

It appears that there are no 0's in A112599 after the 6th row. If so, a(p) = p-1 for every prime p except 5 and 7. - Franklin T. Adams-Watters, Nov 15 2006

Examples

			The 6th row of triangle A112599 is [5,0,4,0,4,0]. So a(7) is the number of these terms which are coprime to 7. Now 5, 4 and 4 are coprime to 7, but the 0's are not; so a(7) = 3.
		

Crossrefs

Cf. A112599, A112635.

Extensions

More terms from Franklin T. Adams-Watters, Nov 15 2006