Oh, dude, like, 270 less than 631 is 361. It's like you're taking 270 away from 631 and you're left with 361. Simple math, man.
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901, add 631 and 270 to get
It ends in 1, so it is rounded down to 630.
601 607 613 617 619 631 641 643 647 653 659 661 673 677 683 691.
1 3 7 9 21 63 Do something dont copy suckers
A prime number is a number that can be divide by itself or one