Abstract
The Stieltjes constants $$\gamma _k(a)$$ appear as the coefficients in the regular part of the Laurent expansion of the Hurwitz zeta function $$\zeta (s,a)$$ about $$s=1$$ . We present the evaluation of $$\gamma _1(a)$$ and $$\gamma _2(a)$$ at rational arguments, this being of interest to theoretical and computational analytic number theory and elsewhere. We give multiplication formulas for $$\gamma _0(a)$$ , $$\gamma _1(a)$$ , and $$\gamma _2(a)$$ , and point out that these formulas are cases of an addition formula previously presented. We present certain integral evaluations generalizing Gauss’ formula for the digamma function at rational argument. In addition, we give the asymptotic form of $$\gamma _k(a)$$ as $$a \rightarrow 0$$ as well as a novel technique for evaluating integrals with integrands with $$\ln (-\ln x)$$ and rational factors.
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