Resumen: We give a rational approximation to Euler''s constant at a geometric rate of convergence, which is easy to compute. Moreover, such an approximation is completely monotonic. The approximants are built up in terms of expectations of the harmonic numbers acting on the standard Poisson process. Idioma: Inglés DOI: 10.1090/mcom/3528 Año: 2020 Publicado en: MATHEMATICS OF COMPUTATION 89, 325 (2020), 2553-2561 ISSN: 0025-5718 Factor impacto JCR: 2.417 (2020) Categ. JCR: MATHEMATICS, APPLIED rank: 48 / 265 = 0.181 (2020) - Q1 - T1 Factor impacto SCIMAGO: 1.95 - Algebra and Number Theory (Q1) - Computational Mathematics (Q1) - Applied Mathematics (Q1)