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5, 4, 12, 13, 3, 6, 10, 15.
5 + 4 = 9
4 + 12 = 16
12 + 13 = 25
13 + 3 = 16
3 + 6 = 9
6 + 10 = 16
10 + 15 = 25.
Is it possible to write all integer from 1 to 10 in a row in some order such that any two adjacent number add up to a prime number ?
Is it possible to write down 1,2,3..100 in some order (one after an other), such that the sum of any two adjacent numbers is a prime number?
On behalf of Sture Sjöstedt
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