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 A305331 #7 May 31 2018 03:53:11
%S A305331 1,6,0,42,55,52,272,171,506,406,93,1332,820,1806,2162,2756,1711,1830,
%T A305331 1474,355,5256,3081,6806,3916,9312,2525,10506,11342,2943,12656,5334,
%U A305331 8515,18632,9591,5513,11325,24492,8802,27722,29756,15931,2715,3629,37056,38612
%N A305331 Multiplicative order of 5 (mod p^2), where p = prime(n), or 0 if 5 and p are not coprime.
%t A305331 Table[If[p==5, 0, MultiplicativeOrder[5, p^2]], {p, Prime@ Range@ 45}] (* _Giovanni Resta_, May 31 2018 *)
%o A305331 (PARI) a(n) = my(p=prime(n)); if(p==5, return(0), return(znorder(Mod(5, p^2))))
%Y A305331 Cf. A211241, A305332, A305333.
%K A305331 nonn
%O A305331 1,2
%A A305331 _Felix Fröhlich_, May 30 2018