2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/127953Nathanson constructed asymptotic bases for the integers with a prescribed representation function, then asked how dense they can be. We can easily obtain an upper bound using a simple argument. In this paper, we will see this is indeed the best bound we can get for asymptotic bases for the integers with an arbitrary representation function prescribed.8 pages, with new abstract and new introductionNumber TheoryCombinatorics11B13, 11B34 (Primary); 11B05, 05A99 (Secondary)Infinitely Often Dense Bases of Integers with a Prescribed Representation Functiontext