4 x (3 + 2) - 1.
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The prime factors are 342 are 2, 3, 3, and 19. Thus the numbers 342 is divisible by are 1, 2, 3, 6, 9, 18, 19, 36, 38, 57, and 342.
If combining digits to form 2-digit numbers is allowed then some solutions are :- 21 + 3 - 5 = 19 23 + 1 - 5 = 19
The prime numbers from 1 - 20 are 2, 3, 5, 7, 11, 13, 17, and 19.
1, 2, 3, 5, 7, 11, 13, 17, and 19.
The prime numbers from 1 to 27 are 2, 3, 5, 7, 11, 13, 17, 19, and 23.