Moree, Pieter Max Planck Institute for Mathematics, Max Planck Society;
http://dx.doi.org/10.1002/mana.201500057 (Verlagsversion)
https://www.mpim-bonn.mpg.de/preblob/5583 (Preprint)
Grau-Moree-Oller-Marcen_MPIM Preprint series 2015-23.pdf (Preprint), 410KB
Grau, J. M., Moree, P., & Oller-Marcén, A. M. (2016). Solutions of the congruence 1+2f(n)+⋯+nf(n)≡0(mod n). Mathematische Nachrichten, 289(7), 820-830. doi:10.1002/mana.201500057.