perplexus.info :: Numbers : Defining a number

Defining a number (Posted on 2019-01-05)

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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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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