2, 5 and 5
2, 3 and 7
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The prime numbers between 40 and 60 are 41, 43, 47, 53 and 59. These sum to 243.
44
Associative
1422, 1431, 1440
18 is not a good first move. The sum of its proper factors is more than 18. Your opponent will have a three point lead. Large prime numbers are good first moves.