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A029984 Numbers n such that n^2 is palindromic in base 3. 6
0, 1, 2, 4, 10, 11, 20, 22, 28, 34, 56, 82, 89, 113, 154, 164, 244, 262, 488, 524, 730, 755, 802, 862, 1021, 1342, 1358, 1460, 2188, 2242, 2684, 2716, 3046, 4276, 4376, 4484, 6562, 6641, 6778, 8030, 8215, 8350, 8887, 12482, 13124, 14810, 19684 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..100

P. De Geest, Palindromic Squares

G. J. Simmons, On palindromic squares of non-palindromic numbers, J. Rec. Math., 5 (No. 1, 1972), 11-19. [Annotated scanned copy]

MATHEMATICA

pal3Q[n_]:=Module[{idn3=IntegerDigits[n^2, 3]}, idn3==Reverse[idn3]]; Select[Range[0, 20000], pal3Q]  (* Harvey P. Dale, May 22 2012 *)

CROSSREFS

Cf. A002778, A003166, A029985, A263607, A263608.

Sequence in context: A243622 A178713 A136818 * A101519 A227204 A249446

Adjacent sequences:  A029981 A029982 A029983 * A029985 A029986 A029987

KEYWORD

nonn,base

AUTHOR

Patrick De Geest

STATUS

approved

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Last modified March 29 18:39 EDT 2017. Contains 284273 sequences.