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It is possible to show 28 as a summation expression.

This represents, 1 + 2 + 3 + 4 + 5 + 6 + 7 = 28

7

∑n

n = 1

28 is the second perfect number ; 22(23 - 1) = 4 x 7 = 28 which is sometimes shown as 22M3 with the bold figures indicating the Mersenne Prime.

However, I am not aware of a solitary symbol that represents 28.

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