

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
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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



