10 lines
199 B
Text
10 lines
199 B
Text
func digit_square_sum_iter(n) is cached {
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if ((n == 1) || (n == 89)) {
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return n
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}
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__FUNC__(n.digits.sum { .sqr })
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}
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say (1..1e6 -> count_by { digit_square_sum_iter(_) == 89 })
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