Hi need help with this problem pls.

We say fenders ( factors enders ) of 156 are 1, 2, 3, 4, 6, 8, 9 and that 156 is a 7 - fender ( that is, it has seven fenders ).
(a) find a 1-fender which is composite.
(b) Show that a number which has 0 and 0 as fenders has at least four more fenders.

Another 7-fender is 460 - its set of fenders is ( 0, 1, 2, 3, 4, 5, 6) , which is different from the set of fenders of 156.
(c) Find three 9- fenders less than 1000 with different sets of fenders. ( got 360, need help with 2 more )

Thanks.