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 A175286 #23 Feb 16 2025 08:33:12 %S A175286 1,1,6,2,4,6,6,2,18,4,10,6,12,6,12,2,8,18,18,4,6,10,22,6,20,12,54,6, %T A175286 28,12,10,2,30,8,12,18,36,18,12,4,20,6,14,10,36,22,46,6,42,20,24,12, %U A175286 52,54,20,6,18,28,58,12,60,10,18,2,12,30,66,8,66,12,70,18,18,36,60,18,30,12,78,4 %N A175286 Pisano period of the Jacobsthal sequence A001045 modulo n. %H A175286 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PisanoPeriod.html">Pisano period</a>. %H A175286 Wikipedia, <a href="http://en.wikipedia.org/wiki/Pisano_period">Pisano period</a>. %e A175286 Reading the sequence 0, 1, 1, 3, 5, 11, 21, ... modulo n=3, we get 0, 1, 1, 0, 2, 2, 0, 1, 1, 0, 2, 2, 0, 1, 1, 0, 2, 2, 0, 1, ... = A088689, which has a period (1, 1, 0, 2, 2, 0) of length a(n=3) = 6. %Y A175286 Cf. A001045, A001175, A088689, A175181. %K A175286 nonn %O A175286 1,3 %A A175286 _R. J. Mathar_, Mar 21 2010