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Almost-pandigital sets (Posted on 2017-07-22) Difficulty: 3 of 5
Consider numbers like 54 and 90.
In the lists of all divisors (for each of those two) 9 distinct digits appear!

54: (1,2,3,6,9,18,27,54); all digits , except 0
90: (1,2,3,5,6,9,10,15,18,30,45,90); 7 excluded

List all such numbers below 1000.

  Submitted by Ady TZIDON    
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Solution: (Hide)
A243542 in OEIS: Numbers n such that the list of divisors of n contains 9 distinct digits (in base 10).

Charlie's program otputs 93 almost-pandigital sets below 1000 as well as (bonus!) 43 actual pandigital sets.

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  Subject Author Date
Solutioncomputer solutionCharlie2017-07-22 11:32:40
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