I believe there would be a total of 1,000 combinations possible, if you're counting 000-999. If you're only counting whole numbers 100 and up (numbers in the hundreds) I think there are 900.
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Possible solutions - using your rules are:- 11,13,17,31,33,37,71,73 &77
99999
If repetition of digits isn't allowed, then no13-digit sequencescan be formed from only 5 digits.
985,958,895,859,589,598. It should be 6. Hope I helped. Possible you want 4 digit numbers using the digits 9 8 and 5 and you want to know how many of those there are?
6 possible 3 digit combonations