A081500 - OEIS

A081500

In a triangle the n-th row begins with n and contains n-1 smallest numbers coprime to n and greater than n. Sequence gives the leading diagonal.

1, 3, 5, 9, 9, 19, 13, 21, 20, 31, 21, 43, 25, 43, 41, 45, 33, 67, 37, 67, 55, 67, 45, 91, 54, 79, 65, 89, 57, 137, 61, 93, 85, 103, 83, 139, 73, 115, 100, 137, 81, 185, 85, 137, 127, 139, 93, 187, 104, 171, 130, 161, 105, 211, 128, 183, 145, 175, 117, 281, 121, 187, 170

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

2 3

3 4 5

4 5 7 9

5 6 7 8 9

6 7 11 13 17 19

7 8 9 10 11 12 13

8 9 11 13 15 17 19 21

LINKS