A025508 Least k>1 such that first n terms of A006928 repeat beginning at k-th term.
3, 4, 4, 13, 13, 19, 19, 19, 19, 28, 28, 28, 28, 28, 28, 100, 100, 405, 405, 405, 405, 405, 405, 405, 608, 608, 608, 608, 608, 608, 608, 608, 608, 608, 608, 608, 608, 1096, 1096, 1096, 1096, 1096, 1096, 1096, 1096, 1096, 1096, 1096, 1096, 1096, 1096, 1096, 1096
Offset: 1