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Answer: 91

Spacing the five numbers as 1 3 7 13 21 (not joined as in question)
differences are 2 4 6 8
6th number then is 21 + 10 = 31
7th is 31 + 12 = 43
8th is 43 + 14 = 57
9th is 57 + 16 = 73
10th is 73 + 18 = 91

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Q: What is the tenth number in the following pattern 1371321?
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