Find the smallest whole number N such that N contains all of the digits from 0 through 9, and N
2 contains all of the digit pairs 00, 11, 22, ..., 99.
Choose 25 different positive integers no higher than fifty, such that none is a multiple of any of the others. What's the lowest total possible, and what's the set? (Note one such set would be 26 through 50 inclusive; however that set totals 950.)