%I #54 Jan 05 2025 19:51:41
%S 191,643,134339,25233137
%N 6-Wall-Sun-Sun primes: primes p such that p^2 divides F_6(A175185(p)), where F_6(i) is the i-th 6-Fibonacci number.
%H Zakariae Bouazzaoui, <a href="https://web.archive.org/web/2024*/https://www.fq.math.ca/Papers1/58-5/bouazzaoui.pdf">On Periods of Fibonacci Sequences and Real Quadratic p-rational Fields</a>, Fibonacci Quart. 58 (2020), no. 5, 103-110. See p. 7.
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Wall%E2%80%93Sun%E2%80%93Sun_prime">Wall-Sun-Sun prime</a>
%o (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, ", "); ); );
%Y Cf. A175185, A238736 (2-Wall-Sun-Sun primes), A271782 (smallest n-Wall-Sun-Sun prime).
%K nonn,hard,more
%O 1,1
%A _Felix Fröhlich_, Dec 23 2020