This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A071776 #7 Mar 30 2012 18:39:02 %S A071776 6,14,26,74,86,134,146,194,206,254,314,326,386,446,554,566,626,674, %T A071776 734,746,794,866,914,926,974,1046,1094,1154,1214,1226,1286,1346,1454, %U A071776 1466,1514,1574,1646,1706,1754,1766,1814,1874,1994,2066,2126,2186,2234,2246 %N A071776 Related to Pisano periods: n such that the period of Fibonacci numbers mod n equals 3*(n+2). %C A071776 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 A071776 (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 A071776 Cf. A071774, A001175. %K A071776 easy,nonn %O A071776 1,1 %A A071776 _Benoit Cloitre_, Jun 04 2002 %E A071776 More terms from Lambert Klasen (Lambert.Klasen(AT)gmx.net), Dec 21 2004