1. Criteria for testing Wall's question Creator: Klaška, Jiří Format: bez média and svazek Type: model:article and TEXT Subject: Fibonacci numbers, Wall's question, Wall-Sun-Sun prime, Fibonacci-Wieferich prime, modular periodicity, and periodic sequence Language: English Description: In this paper we find certain equivalent formulations of Wall's question and derive two interesting criteria that can be used to resolve this question for particular primes. Rights: http://creativecommons.org/publicdomain/mark/1.0/ and policy:public