2016-12-05 23:44:36 +01:00
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func happy(n) is cached {
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static seen = Hash()
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return true if n.is_one
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2018-08-17 15:15:24 +01:00
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return false if seen.exists(n)
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2016-12-05 23:44:36 +01:00
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seen{n} = 1
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2018-08-17 15:15:24 +01:00
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happy(n.digits.sum { _*_ })
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2016-12-05 23:44:36 +01:00
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}
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2020-02-17 23:21:07 -08:00
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say happy.first(8)
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