A071776 Related to Pisano periods: n such that the period of Fibonacci numbers mod n equals 3*(n+2).

6, 14, 26, 74, 86, 134, 146, 194, 206, 254, 314, 326, 386, 446, 554, 566, 626, 674, 734, 746, 794, 866, 914, 926, 974, 1046, 1094, 1154, 1214, 1226, 1286, 1346, 1454, 1466, 1514, 1574, 1646, 1706, 1754, 1766, 1814, 1874, 1994, 2066, 2126, 2186, 2234, 2246

Offset: 1

Author

Benoit Cloitre, Jun 04 2002

Keywords

• easy
• nonn

Comments

a(n)/2 are primes with final digit 3 or 7 among primes in a related sequence: "m such that the period of Fibonacci numbers mod m equals 2*(m+1)".

Crossrefs

Cf. A071774, A001175.

Programs

PARI

for(n=2,4000,t=3*(n+2);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
				

Extensions

More terms from Lambert Klasen (Lambert.Klasen(AT)gmx.net), Dec 21 2004