A048207 a(n)=least m such that column m of T that contains n, array T given by A048201.

1, 1, 2, 1, 1, 2, 3, 1, 2, 1, 3, 4, 2, 1, 1, 1, 3, 2, 4, 5, 1, 1, 3, 2, 1, 1, 4, 1, 5, 6, 2, 3, 1, 1, 1, 1, 4, 1, 3, 1, 5, 1, 6, 7, 3, 1, 4, 1, 1, 1, 2, 5, 1, 2, 4, 6, 1, 7, 8, 1, 2, 1, 5, 1, 1, 4, 2, 6, 2, 1, 2, 7, 3, 8, 9, 5, 1, 2, 3, 1, 1, 2, 1, 6, 1, 1, 3, 5, 7, 1