|
%I #12 May 15 2023 08:43:52
%S 193,386,461,523,579,772,887,922,1019,1046,1158,1351,1383,1544,1569,
%T 1774,1844,1861,2038,2092,2123,2153,2269,2316,2509,2661,2702,2766,
%U 2887,3057,3088,3138,3227,3391,3449,3541,3548,3661,3667,3688,3722,3919
%N Moduli n for which A248218(n) = 8.
%C If x and y are members, then so is LCM(x,y). - _Robert Israel_, Mar 08 2021
%H Robert Israel, <a href="/A256348/b256348.txt">Table of n, a(n) for n = 1..10000</a>
%p filter:= proc(n) local x,k,R;
%p x:= 0; R[0]:= 0;
%p for k from 1 do
%p x:= x^2+1 mod n;
%p if assigned(R[x]) then return evalb(k-R[x] = 8)
%p else R[x]:= k fi
%p od;
%p end proc:
%p select(filter, [$1..5000]); # _Robert Israel_, Mar 08 2021
%t filter[n_] := Module[{x, k, R}, x = 0; R[0] = 0; For[k = 1, True, k++, x = Mod[x^2+1, n]; If[IntegerQ[R[x]], Return[k - R[x] == 8], R[x] = k]]];
%t Select[Range[4000], filter] (* _Jean-François Alcover_, May 15 2023, after _Robert Israel_ *)
%o (PARI) for(i=1,3000,A248218(i)==8&&print1(i","))
%Y Cf. A248218, A248219, A256342 - A256349, A003095, A247981.
%K nonn
%O 1,1
%A _M. F. Hasler_, Mar 25 2015
|
