25 and 36 are each equal to their rightmost digit squared.
25 = 5 X 5
36 = 6 X 6
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Any two digit nuber from 10-99 can be squared or cubed.
10. Any number can be squared or cubed.
just take a a number like 32 and square it, you have 1024 this is the smallest one. Another is 1681 since this is 41 squared
The answer will depend on how many digits there are in each of the 30 numbers. If the 30 numbers are all 6-digit numbers then the answer is NONE! If the 30 numbers are the first 30 counting numbers then there are 126 combinations of five 1-digit numbers, 1764 combinations of three 1-digit numbers and one 2-digit number, and 1710 combinations of one 1-digit number and two 2-digit numbers. That makes a total of 3600 5-digit combinations.
There are 28706 such combinations. 5456 of these comprise three 2-digit numbers, 19008 comprise two 2-digit numbers and two 1-digit numbers, 4158 comprise one 2-digit number and four 1-digit numbers and 84 comprise six 1-digit numbers.