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Anonymous
2)490
5)245
7)49
7)7 = 1
When reduced to '1'
Then the four numbers are 2,5,7,7. All prime numbers.
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As a product of its prime factors: 2*5*7*7 = 490
It is: 490/17 times 17 = 490
1,2,5,10, 70, 490, Etc. Etc...
70 and 7
35 = 490