A131879 Triangle where row n contains the first n positive integers which are coprime to (2^n -1).

1, 1, 2, 1, 2, 3, 1, 2, 4, 7, 1, 2, 3, 4, 5, 1, 2, 4, 5, 8, 10, 1, 2, 3, 4, 5, 6, 7, 1, 2, 4, 7, 8, 11, 13, 14, 1, 2, 3, 4, 5, 6, 8, 9, 10, 1, 2, 4, 5, 7, 8, 10, 13, 14, 16, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 1, 2, 4, 8, 11, 16, 17, 19, 22, 23, 29, 31, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 1, 2, 4