2 I think...
Two factors which are itself and one because 13 is a Prime number.
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Factors: 286=2*11*13 429=3*11*13 Common factors: 11, 13
The prime factors of 494 are 2, 13, and 19. The prime factors of 741 are 3, 13, and 19. The common factors are 13 and 19, so the greatest common factor is 13 x 19 = 247.
The factors of 78 are: 1, 2, 3, 6, 13, 26, 39, 78 The factors of 91 are: 1, 7, 13, 91 The factors of 156 are: 1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78, 156 The common factors are: 1, 13 The Greatest Common Factor: GCF = 13
Well, honey, the positive odd factors of 36 are 1, 3, and 9. Add those bad boys up and you get 13. So, the sum of the positive odd factors of 36 is 13. Hope that satisfies your math cravings, sweetie!
The prime factors of 312 are: 2, 3, 13