18713, 18719, 18731, 18743, 18749 18731 is the center of the 5 primes. Notice that the distance from it to each on the the left and right is the same. Now do you see what a symmetrical primes is?
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Two primes are symmetric primes of a natural number (n) if their average is n. For example 10, has two pairs of symmetric primes. 7 and 13, and 3 and 17 because their averages are 10.
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They can be either. If they are roots of a real polynomial then purely imaginary would be symmetric and only real roots can be skew symmetric.
It depends what you mean by symmetric. If you mean that there are the same number of factors on each branch, then the answer is No. eg 20 / \ 4 5 / \ 2 2
I use symmetric rounding. -0.285 rounds to -0.3