Geodesic
Criteria for testing Wall's question
Czechoslovak Mathematical Journal, Tome 58 (2008) no. 4, pp. 1241-1246.

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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.
Classification : 11A07, 11B39, 11B50
Keywords: Fibonacci numbers; Wall's question; Wall-Sun-Sun prime; Fibonacci-Wieferich prime; modular periodicity; periodic sequence 
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     title = {Criteria for testing {Wall's} question},
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Klaška, Jiří. Criteria for testing Wall's question. Czechoslovak Mathematical Journal, Tome 58 (2008) no. 4, pp. 1241-1246. http://geodesic.mathdoc.fr/item/CMJ_2008__58_4_a27/