OFFSET
1,1
LINKS
Zakariae Bouazzaoui, On Periods of Fibonacci Sequences and Real Quadratic p-rational Fields, Fibonacci Quart. 58 (2020), no. 5, 103-110. See p. 7.
Wikipedia, Wall-Sun-Sun prime
PROG
(PARI) my(b=6); forprime(p=2, , if( (([0, 1; 1, b]*Mod(1, p^2))^(p-kronecker(b^2+4, p)))[1, 2]==0, print1(p, ", "); ); );
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Felix Fröhlich, Dec 23 2020
STATUS
approved