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Base 4 palindromes of even length divided by 5. a(n) = A048703(n)/5.
4

%I #12 May 27 2024 07:14:30

%S 0,1,2,3,13,17,21,25,26,30,34,38,39,43,47,51,205,221,237,253,257,273,

%T 289,305,309,325,341,357,361,377,393,409,410,426,442,458,462,478,494,

%U 510,514,530,546,562,566,582,598,614,615,631,647,663,667,683,699,715,719

%N Base 4 palindromes of even length divided by 5. a(n) = A048703(n)/5.

%H Amiram Eldar, <a href="/A048704/b048704.txt">Table of n, a(n) for n = 0..10000</a>

%t q[n_] := EvenQ[IntegerLength[5*n, 4]] && PalindromeQ[IntegerDigits[5*n, 4]]; Select[Range[0, 1000], q] (* _Amiram Eldar_, May 27 2024 *)

%Y Cf. A048702 (base 2 palindromes of even length divided by 3), A048703.

%K nonn,base

%O 0,3

%A _Antti Karttunen_, Mar 07 1999

%E More terms from _Amiram Eldar_, May 27 2024