A112635 a(n) = rightmost term of n-th row of triangle A112592. (For n >= 2, a(n) = number of terms in the (n-1)th row of triangle A112592 which are coprime to n.)
0, 0, 1, 2, 4, 0, 3, 5, 4, 1, 10, 0, 6, 2, 13, 10, 16, 1, 18, 6, 14, 8, 22, 4, 23, 6, 17, 8, 28, 15, 30, 11, 19, 18, 24, 2, 36, 21, 28, 12, 40, 12, 42, 20, 24, 21, 46, 12, 47, 24, 36, 2, 40, 21, 49, 37, 22, 26, 58, 14, 60, 31, 51, 44, 50, 8, 66, 36, 44, 23, 70, 8, 72, 37, 55, 40, 62, 20
Offset: 1
Keywords
Examples
The 6th row of triangle A112592 is [5,0,5,0,5,0]. So a(7) is the number of these terms which are coprime to 7. Now the three 5's are coprime to 7, but the 0's are not; so a(7) = 3.
Links
- Diana Mecum, Table of n, a(n) for n = 1..517 [From _Diana L. Mecum_, Aug 12 2008]
Extensions
Terms a(10) through a(517) from Diana L. Mecum, Aug 12 2008