13, 77.
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There are no three composite numbers that multiply to 1001.
Oh, dude, you want me to find 4-digit numbers where the digits add up to 2? That's like finding a needle in a haystack! But hey, I'm up for the challenge. The only number that fits the bill is 1001. So, there you go, one lonely 4-digit number with a digit sum of 2.
1110
Sum of first n numbers = n/2(n +1) = 500 x 1001 = 500500