A043003 - OEIS

A043003

Base-4 palindromes that start with 1.

1, 5, 17, 21, 25, 29, 65, 85, 105, 125, 257, 273, 289, 305, 325, 341, 357, 373, 393, 409, 425, 441, 461, 477, 493, 509, 1025, 1105, 1185, 1265, 1285, 1365, 1445, 1525, 1545, 1625, 1705, 1785, 1805, 1885, 1965, 2045, 4097, 4161

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

MATHEMATICA

Join[{1}, Table[FromDigits[#, 4]&/@(Join[{1}, #, {1}]&/@Select[Tuples[ Range[ 0, 3], n], #==Reverse[#]&]), {n, 0, 5}]//Flatten]

CROSSREFS

Cf. A043047.

Sequence in context: A045095 A061940 A038470 * A246329 A351176 A211423

Adjacent sequences: A043000 A043001 A043002 * A043004 A043005 A043006

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved