Year 1638 falls into the 17th Century.
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1638.
yes 1,601 more
42 times 39 equals 1638.
1, 2, 3, 6, 7, 9, 13, 14, 18, 21, 26, 39, 42, 63, 78, 91, 117, 126, 182, 234, 273, 546, 819, 1638.
If that's 16 and 38, it could be estimated as 15 x 40 = 600