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1$\begingroup$ These do not look remotely impressive to me! Can you give any more details? The exp(pi.sqrt(163)) story is to do with modular forms and imaginary quadratic fields; for real quadratic fields the story is different. The log of the fundamental solution to Pell's equation will show up in the formula of a special value of an L-function by the class number formula (so it's possible to imagine that $4+sqrt(17)$ is close to exp of something explicit) but I don't know how to go further. $\endgroup$– zntCommented Dec 12, 2016 at 11:25
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3$\begingroup$ The name is Kronecker's limit formula. Kronecker's solution of Pell's equation by means of special values of Dedekind's eta function was obtained by the limit formula (Grenzformel), and was regarded at the time as a crowning jewel of the theory of modular functions. You will enjoy reading about this in the last chapter of Andre Weil's book (Elliptic functions according to Eisenstein and Kronecker), or in Vladut's book on the Jugendtraum. The limit formula, giving close approximations of this type, was at the basis of the Gelfond-Linnik-Baker solution to Gauss's class number one problem. $\endgroup$– Vesselin DimitrovCommented Dec 12, 2016 at 16:20
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