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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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Earn +20 ptsQ: Is there a symbol for the number 28?
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