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 A079348 #14 Aug 09 2025 17:01:47 %S A079348 13,17,29,37,41,47,53,61,73,89,97,101,107,109,113,137,139,149,151,157, %T A079348 173,181,193,197,199,211,229,233,241,257,263,269,277,281,293,307,313, %U A079348 317,331,337,347,349,353,373,389,397,401,409,421,433,449,457,461 %N A079348 Fibonacci(p-(p/5)) is the not the first Fibonacci number that p divides. %H A079348 Amiram Eldar, <a href="/A079348/b079348.txt">Table of n, a(n) for n = 1..10000</a> %e A079348 a(1) = 13 as (13/5) = -1, F(14) = 377 = 13 * 29, however F(7) = 13. %o A079348 (PARI) quad5(x)=if (x%5>1 && x%5<4,-1,1); %o A079348 forprime (p=7,500, wss=p-quad5(p); for (n=1, wss,if (fibonacci(n)%p==0,if (n<wss,print1(p","); break)))) %Y A079348 Cf. A079346, A079347, A079349. %K A079348 nonn %O A079348 1,1 %A A079348 _Jon Perry_, Jan 04 2003 %E A079348 Offset corrected by _Amiram Eldar_, Jun 22 2024