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 A354886 #15 Jun 16 2022 02:33:34 %S A354886 16,52,160,484,1312,1456,3904,4372,11680,12688,13120,35008,37960, %T A354886 39364,104992,106288,113776,116800,118096,314944,319156,341224,350080, %U A354886 354292,944800,948688,957760,1023568,1027456,1049920,1058992,1062880,2834368,2847004,2873572 %N A354886 Numbers that are palindromes in both ternary and balanced ternary representations with representations that are different. %C A354886 Is a(n) == 16 (mod 18) for all n? %H A354886 Amiram Eldar, <a href="/A354886/b354886.txt">Table of n, a(n) for n = 1..10000</a> %F A354886 a(n) = A091077(n) / 4. - _Hugo Pfoertner_, Jun 10 2022 %e A354886 16 is a term since its ternary representation is 121 and its balanced ternary representation (with 2 standing for the -1 digit) is 1221, and both are palindromes. %t A354886 Select[Range[0, 3*10^6], PalindromeQ[d3 = IntegerDigits[#, 3]] && PalindromeQ[db3 = balTernDigits[#]] && d3 != db3 &] (* using balTernDigits by _Robert G. Wilson v_ at A134027 *) %Y A354886 Equals A354885 \ A005836. %Y A354886 Cf. A007089, A014190, A091077, A134027, A140267. %K A354886 nonn,base %O A354886 1,1 %A A354886 _Amiram Eldar_, Jun 10 2022