I don't like the exceptions (4879, 5292, 38962...) -- it feels like they don't belong in the sequence. And look how pretty the code is without them!
def kaprekar?(k) s = k.to_s.size k_sq = (k**2).to_s k_sq.prepend("0") if (k_sq.size.even? == false) part1 = k_sq[0..s-1].to_i part2 = k_sq[s..-1].to_i return true ? k == part1 + part2 : false end
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I don't like the exceptions (4879, 5292, 38962...) -- it feels like they don't belong in the sequence. And look how pretty the code is without them!