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A069707 Squares with property that swapping first and last digits also gives a square. 2
1, 4, 9, 100, 121, 144, 169, 400, 441, 484, 676, 900, 961, 1521, 1681, 1764, 4624, 4761, 5625, 9409, 10000, 10201, 10404, 10609, 11881, 12321, 14161, 14641, 16641, 17161, 19321, 19881, 40000, 40401, 40804, 41209, 43264, 44944, 47524, 49284 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..40.

EXAMPLE

1764 and 4761 both are squares hence both are members.

MATHEMATICA

Do[t = IntegerDigits[n^2]; u = t; u[[1]] = t[[ -1]]; u[[ -1]] = t[[1]]; t = FromDigits[u]; If[ IntegerQ[ Sqrt[t]], Print[n^2]], {n, 1, 300}]

CROSSREFS

Cf. A069706, A069708.

Sequence in context: A115690 A115689 A061457 * A129967 A182020 A087553

Adjacent sequences:  A069704 A069705 A069706 * A069708 A069709 A069710

KEYWORD

nonn,base

AUTHOR

Amarnath Murthy, Apr 08 2002

EXTENSIONS

Edited and extended by Robert G. Wilson v

Edited by N. J. A. Sloane, Jan 20 2009

STATUS

approved

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Last modified January 19 00:40 EST 2020. Contains 331030 sequences. (Running on oeis4.)