(3^ 2 * 4) + 7
(9 * 4) + 7
36 + 7
43
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2 and 43 (they are the only ones)
50
They are: 41, 43 and 47 that have only 2 factors because they are all prime numbers
2 is the only even prime number, and it can be added to several odd numbers to make another prime number.For example:5 + 2 = 711 + 2 = 1317 + 2 = 1941 + 2 = 43
1 x 43, 43 x 1