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 A071774 Related to Pisano periods: n such that the period of Fibonacci numbers mod n equals 2*(n+1). 5
 3, 7, 13, 17, 23, 37, 43, 53, 67, 73, 83, 97, 103, 127, 137, 157, 163, 167, 173, 193, 197, 223, 227, 257, 277, 283, 293, 313, 317, 337, 367, 373, 383, 397, 433, 443, 457, 463, 467, 487, 503, 523, 547, 577, 587, 593, 607, 613, 617, 643, 647, 653, 673, 683, 727 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Terms are primes with final digit 3 or 7. LINKS PROG (PARI) for(n=2, 5000, t=2*(n+1); good=1; if(fibonacci(t)%n==0, for(s=0, t, if(fibonacci(t+s)%n!=fibonacci(s)%n, good=0; break); if(s>1&&s

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Last modified September 19 01:08 EDT 2018. Contains 315153 sequences. (Running on oeis4.)