The digit-sums are as follows: 131 → 1 + 3 + 1 = 5 151 → 1 + 5 + 1 = 7 181 → 1 + 8 + 1 = 10 → 1 + 0 = 1 171 → 1 + 7 + 1 = 9 161 → 1 + 6 + 1 = 8 Only 161 has its digit-sum even.
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