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Let $f(z)=\sum_{n=1}^\infty c_n z^n$ be entire function on the complex plane. May we express the property $\int_0^\infty |f(x)|^2 /x dx<\infty$ or some other property controlling the behavior for large positive $x$ in terms of coefficients? This property is quite rare:if we change finitely many coefficients arbitrarily, it no longer holds. To be more specific: for given sequence $(a_n) $, can we find all good sequences $(c_n) $ for which $(a_n c_n) $ is also good? Generically, how many such pairs of good sequences do we have?

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