This doesn't work. For 11, (11² - 11) % 10 = (121 - 11) % 10 = 110 % 10 = 0. Your function would return true, but 11 is not automorphic.
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This doesn't work. For 11, (11² - 11) % 10 = (121 - 11) % 10 = 110 % 10 = 0. Your function would return true, but 11 is not automorphic.