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Jun 10, 2021 at 22:42 history edited Yaakov Baruch CC BY-SA 4.0
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Jun 10, 2021 at 22:39 comment added Wojowu Definitely $A_2+A_2+A_2$ contains all sufficiently large numbers, since all large enough numbers are a sum of three powerful numbers. Wikipedia attributes this result to Heath-Brown. They also mention all integers are differences of powerful numbers, so $A_2-A_2=\mathbb Z$.
Jun 10, 2021 at 22:36 history asked Yaakov Baruch CC BY-SA 4.0