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The number is 1.
You square each number and multiply that by the frequency with which that number appears. You then sum together these results.
25 is the sum of 9 and 16. (52 = 32 + 42)
81...........
let the no. be 9 square of 9=9*9=81 sum of the digits of square = 8+1=9 so if the no.=sum of the digits the it is a neon number