MariaDB [test]> select cnt,min(nr),max(nr),count(nr) from gb group by cnt having cnt < 16 order by cnt;
+-----+---------+---------+-----------+
| cnt | min(nr) | max(nr) | count(nr) |
+-----+---------+---------+-----------+
|   1 |       4 |      12 |         4 |
|   2 |      10 |      68 |         9 |
|   3 |      22 |     128 |        11 |
|   4 |      34 |     152 |        11 |
|   5 |      48 |     188 |        16 |
|   6 |      60 |     332 |        16 |
|   7 |      78 |     398 |        18 |
|   8 |      84 |     368 |        20 |
|   9 |      90 |     488 |        23 |
|  10 |     114 |     632 |        16 |
|  11 |     144 |     692 |        29 |
|  12 |     120 |     626 |        16 |
|  13 |     168 |     992 |        25 |
|  14 |     180 |     878 |        27 |
|  15 |     234 |     908 |        23 |
+-----+---------+---------+-----------+
15 rows in set (1.21 sec)