99

99 is a Kaprekar number, 98 + 01 = 99 and 99² = 9801

1/ 99 = 0101010101010101010101....

99⁵ = 4⁵+13⁵+19⁵+20⁵+67⁵+96⁵

99⁵ = 6⁵+17⁵+60⁵+64⁵+73⁵+89⁵

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