The winner is Peter Kaufeler of London, UK. There were 287 entries. Solvers will probably approach the problem through the 2-digit prime, but it is more interesting to see how it can be solved through ...
The winner is Richard Harvey of Ancaster, Ontario, Canada. There were 257 entries. N cannot be 0, because the only 3-digit squares whose middle digit is 0 are 100, 400, 900; and although there are 217 ...
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