1,2,3,4 and 1 million.
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3+5 = 8 = 5+3 commutative is just switching the numbers around and the answers stay the same.
271 of the first 1000 natural numbers contain at least one digit 5. That is 27.1 % of them.
The numbers of 3, 4 and 5 are an example of a Pythagorean triplet
3
There are 80 such numbers.