Moments of Gamma type and three-parametric Mittag-Leffler function

We study a class of positive random variables having moments of Gamma type, whose density can be expressed by the three-parametric Mittag-Leffler functions. We give some necessary conditions and some sufficient conditions for their existence. As a corollary, we give some conditions for non-negativity of the three-parametric Mittag-Leffler functions. As an application, we study the infinite divisibility of the powers of half $\text{a}$-Cauchy variable. In addition, we find that a random variable $\text{X}$ having moment of Gamma type if and only if $\log \text{X}$ is quasi infinitely divisible. From this perspective, we can solve many Hausdorff moment problems of sequences of factorial ratios.