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 A170986 #13 Mar 09 2023 09:58:46 %S A170986 0,1,4,4,1,25,36,49,34,41,100,121,119,114,106,100,106,114,119,121,25, %T A170986 41,34,49,36,625,676,729,654,701,900,961,899,934,991,1225,1171,1219, %U A170986 1139,1181,850,781,839,769,821,1025,1091,1009,1074,1111,2500,2601,2579,2554,2526 %N A170986 Carryless product n X n in base 5. %H A170986 Seiichi Manyama, <a href="/A170986/b170986.txt">Table of n, a(n) for n = 0..3124</a> %H A170986 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 A170986 <a href="/index/Ca#CARRYLESS">Index entries for sequences related to carryless arithmetic</a> %o A170986 (PARI) a(n) = fromdigits(Vec(Pol(digits(n, 5))^2)%5, 5); \\ _Seiichi Manyama_, Mar 09 2023 %Y A170986 For bases 2 through 10 see A000695, A169999, A170985-A170990 and A059729. %K A170986 nonn,base,look %O A170986 0,3 %A A170986 _N. J. A. Sloane_, Aug 29 2010