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. We consider the diophantine approximation of exponential generating functions at rational arguments by their partial sums and by convergents of their (simple) continued fractions. We establish quantitative results showing that these two sets of approximations coincide very seldom. Moreover, we offer many conjectures about the frequency of their coalescence. In particular, we consider exponential generating functions with real Dirichlet characters and with coefficients of L-functions of elliptic curves, where calculational data provide striking examples showing agreement for certain partial quotients of high index and gargantuan heights. Lastly, we similarly examine hypergeometric functions; note that e is a special case of the latter.

Dirichlet $L$-functions, elliptic curves, hypergeometric functions, and rational approximation with partial sums of power series