A170986 - OEIS

%I #13 Mar 09 2023 09:58:46

%S 0,1,4,4,1,25,36,49,34,41,100,121,119,114,106,100,106,114,119,121,25,

%T 41,34,49,36,625,676,729,654,701,900,961,899,934,991,1225,1171,1219,

%U 1139,1181,850,781,839,769,821,1025,1091,1009,1074,1111,2500,2601,2579,2554,2526

%N Carryless product n X n in base 5.

%H Seiichi Manyama, <a href="/A170986/b170986.txt">Table of n, a(n) for n = 0..3124</a>

%H David Applegate, Marc LeBrun and N. J. A. Sloane, <a href="http://neilsloane.com/doc/carry1.pdf">Carryless Arithmetic (I): The Mod 10 Version</a>.

%H <a href="/index/Ca#CARRYLESS">Index entries for sequences related to carryless arithmetic</a>

%o (PARI) a(n) = fromdigits(Vec(Pol(digits(n, 5))^2)%5, 5); \\ _Seiichi Manyama_, Mar 09 2023

%Y For bases 2 through 10 see A000695, A169999, A170985-A170990 and A059729.

%K nonn,base,look

%O 0,3

%A _N. J. A. Sloane_, Aug 29 2010