Perfect numbers: Difference between revisions
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→Functional (faster version): Updated primitives, tidied. |
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# p :: Int -> Bool |
# p :: Int -> Bool |
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def p(x): |
def p(x): |
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'Factor of n |
'Factor of n ?' |
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return 0 == (n % x) |
return 0 == (n % x) |
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'''Concatenated list over which a function has been mapped. |
'''Concatenated list over which a function has been mapped. |
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The list monad can be derived by using a function f which |
The list monad can be derived by using a function f which |
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wraps its output a in list |
wraps its output a in list, |
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(using an empty list to represent computational failure).''' |
(using an empty list to represent computational failure).''' |
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return lambda xs: list( |
return lambda xs: list( |
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