Factorizations for 231 are:
1) 231 = 1x231
2) 231 = 3x7x11
3) 231 = 21x11
4) 231 = 3x77
5) 231 = 33x7
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24 x 31 x 231
Prime factorization:143 = 11 x 13231 = 3 x 7 x 1111 x 13 x 3 x 7 = 3003 (the LCM of 143 and 231).
1 x 231, 3 x 77, 21 x 11, 33 x 7. Add the digits and you get 6, which means it is divisible by 3. (3 x 77) 77 has two prime factors, 7 and 11. So you can multiply any combination of the factors to get 231. 3C2 (3 choose 2) in Pascal's triangle is 3, which means there are three possible combinations. Oh, yeah, and you can always just do 1 x 231.
693
231 + 194 = 425