How many different numbers are obtainable from five 5s by first concatenating some of the 5s, then multiplying the results?
Not sure what you are asking, but maybe
5 x 5
5 x 55
5 x 555
5 x 5555
55 x 55
55 x 555
the rest of the problem reads: For example, we could obtain 5 x 55 x 55, 555 x 55, or 55555, but not 5 x 5 or 2525. I'm confused too
+37159 
