Self Hell

More stateful functions.

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def primes(p_cache=[2]):
    for i in p_cache:
        yield i
    for i in count(p_cache[-1] + 1):
        sqr = int(i**0.5) + 1
        if all(i%p for p in takewhile(lambda x: x<sqr, p_cache)):
            p_cache.append(i)
            yield i
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