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1 = 1 - 0

3 = 4 - 1

5 = 9 - 4

7 = 16 - 9

9 = 25 - 16

11 = 36 - 25

13 = 49 - 36

15 = 64 - 49

17 = 81 - 64

19 = 100 - 81

0 = 0 + 0

2 = 1 + 1

4 = 0 + 4

8 = 4 + 4

10 = 1 + 9

12 = 16 - 4

16 = 0 + 16

18 = 9 + 9

20 = 4 + 16

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11y ago
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Q: Which numbers up to 20 can be written as either the difference or the sum as two square numbers?
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