Esempio n. 1
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def is_lychrel(n):
    start = n + rev(n)
    iterations = iterate(lambda x: x + rev(x), start)
    return not any(is_palindromic(y) for y in take(50, iterations))
Esempio n. 2
0
def problem57():
    generate_tails = iterate(tail, 2) # yields 2, tail(2), tail(tail(2)), ...
    expansions = (1 + Fraction(1, t) for t in generate_tails)
    return quantify(take(1000, expansions), pred=check_numerator)