9 lines
159 B
Python
9 lines
159 B
Python
m = 166
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while 1:
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five = m * (3 * m - 1)
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n = int(five ** 0.5)
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if five == n * (n + 1) and n % 2 == 1:
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break
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m += 1
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print m * (3 * m - 1) / 2
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