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Defining a number (Posted on 2019-01-05) Difficulty: 3 of 5
My number consists of 3 digits in strictly increasing order. It is a semiprime number, both factors terminating by the same digit.
Find it.

Bonus: is there a solution for 4-digit number?

No Solution Yet Submitted by Ady TZIDON    
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Comments: ( Back to comment list | You must be logged in to post comments.)
solutions | Comment 1 of 2
Your number has cousins.

The terminal digit of the factors can only be 3 or 7.

3*43=129
3*53=159
3*83=249
3*263=789

7*37=259
7*67=469
7*97=679

13*13=169
13*53=689

17*17=289

I'll look for 4-digit solutions later.

  Posted by xdog on 2019-01-05 08:50:36
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