login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A321473 Nonnegative numbers whose nonzero digits in ternary expansion are palindromic. 2
0, 1, 2, 3, 4, 6, 8, 9, 10, 12, 13, 16, 18, 20, 23, 24, 26, 27, 28, 30, 31, 34, 36, 37, 39, 40, 46, 48, 52, 54, 56, 59, 60, 62, 65, 68, 69, 72, 74, 78, 80, 81, 82, 84, 85, 88, 90, 91, 93, 94, 100, 102, 106, 108, 109, 111, 112, 117, 118, 120, 121, 130, 136, 138 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

This sequence corresponds to the fixed points of A321464, and contains A014190.

LINKS

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

EXAMPLE

For n = 1594426:

- the ternary expansion of 1594426 is "10000000010211",

- the corresponding nonzero digits are "11211", which are palindromic,

- hence 1594426 belongs to the sequence.

MATHEMATICA

Select[Range[0, 200], PalindromeQ[FromDigits[IntegerDigits[#, 3]/.(0-> Nothing)]]&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jun 22 2020 *)

PROG

(PARI) is(n, base=3) = my (t=select(sign, digits(n, base))); t==Vecrev(t)

CROSSREFS

Cf. A014190, A321464.

Sequence in context: A026431 A026433 A015858 * A125292 A101513 A153276

Adjacent sequences:  A321470 A321471 A321472 * A321474 A321475 A321476

KEYWORD

nonn,base

AUTHOR

Rémy Sigrist, Nov 11 2018

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 17 06:30 EDT 2021. Contains 343965 sequences. (Running on oeis4.)