A048704 Base 4 palindromes of even length divided by 5. a(n) = A048703(n)/5.

0, 1, 2, 3, 13, 17, 21, 25, 26, 30, 34, 38, 39, 43, 47, 51, 205, 221, 237, 253, 257, 273, 289, 305, 309, 325, 341, 357, 361, 377, 393, 409, 410, 426, 442, 458, 462, 478, 494, 510, 514, 530, 546, 562, 566, 582, 598, 614, 615, 631, 647, 663, 667, 683, 699, 715, 719

Offset: 0

Author

Antti Karttunen, Mar 07 1999

Keywords

• nonn
• base

Links

• Amiram Eldar, Table of n, a(n) for n = 0..10000

Crossrefs

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

Programs

Mathematica

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

Extensions

More terms from Amiram Eldar, May 27 2024