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%I #7 Mar 30 2012 18:39:02
%S 6,14,26,74,86,134,146,194,206,254,314,326,386,446,554,566,626,674,
%T 734,746,794,866,914,926,974,1046,1094,1154,1214,1226,1286,1346,1454,
%U 1466,1514,1574,1646,1706,1754,1766,1814,1874,1994,2066,2126,2186,2234,2246
%N Related to Pisano periods: n such that the period of Fibonacci numbers mod n equals 3*(n+2).
%C 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)".
%o (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<t-1&&fibonacci(s)%n==0, cur=s;good2=1;for(ss=0,s, if(fibonacci(ss+s)%n!=fibonacci(ss)%n,good2=0;break)); if(good2,good=0;break););); if(good,print1(n,",")))) (Klasen)
%Y Cf. A071774, A001175.
%K easy,nonn
%O 1,1
%A _Benoit Cloitre_, Jun 04 2002
%E More terms from Lambert Klasen (Lambert.Klasen(AT)gmx.net), Dec 21 2004