A082205 Palindromes pertaining to A082204.

1, 22, 232, 3223, 22322, 232232, 3223223, 22322322, 232232232, 3223223223, 22322322322, 232232232232, 3223223223223, 22322322322322, 232232232232232, 3223223223223223, 22322322322322322, 232232232232232232, 3223223223223223223

Offset

1,2

Comments

Perhaps no digits other than 1,2 and 3 occur. From the second term onwards the periodic pattern of two 2's followed by a 3 holds.

Links

Table of n, a(n) for n=1..19.

Index entries for linear recurrences with constant coefficients, signature (0, 0, 1001, 0, 0, -1000).

Example

The first six palindromes are:  1, 22, 232, 3223,22322, 232232.

Mathematica

Join[{1}, LinearRecurrence[{0, 0, 1001, 0, 0, -1000}, {22, 232, 3223, 22322, 232232, 3223223}, 18]] (* Ray Chandler, Aug 25 2015 *)

Crossrefs

Cf. A082204, A082206.

Sequence in context: A047647 A010938 A022617 * A003205 A037268 A091783

Adjacent sequences: A082202 A082203 A082204 * A082206 A082207 A082208

Keyword

base,easy,nonn

Author

Amarnath Murthy, Apr 10 2003

Extensions

More terms from Joshua Zucker, May 08 2006

Status

approved