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Search: id:A069707
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| A069707 |
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Squares with property that swapping first and last digits also gives a square. |
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+0
3
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| 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; listen)
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OFFSET
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1,2
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EXAMPLE
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1764 and 4761 both are squares hence both are members.
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MATHEMATICA
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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}]
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CROSSREFS
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Cf. A069706, A069708.
Sequence in context: A115690 A115689 A061457 this_sequence A129967 A087553 A061850
Adjacent sequences: A069704 A069705 A069706 this_sequence A069708 A069709 A069710
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KEYWORD
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nonn,base
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 08 2002
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EXTENSIONS
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Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com),
Edited by N. J. A. Sloane (njas(AT)research.att.com), Jan 20 2009
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