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They are 1, 13, 43 and 559.
multiples of 43 =43, 86, 129, 172, 215, 258, 301, 344, 387, 430, 473, 516, 559,...to get the multiples of 43, add 43 each time.43 + 43 = 8686 + 43 = 129129 + 43 = 172, ...
-56
The product is 559.
13 x 43