id:A102859 - OEIS Search Results

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Numbers which when squared and written backwards give a square again.

+0
3

1, 2, 3, 10, 11, 12, 13, 20, 21, 22, 26, 30, 31, 33, 99, 100, 101, 102, 103, 110, 111, 112, 113, 120, 121, 122, 130, 200, 201, 202, 210, 211, 212, 220, 221, 260, 264, 300, 301, 307, 310, 311, 330, 836, 990, 1000, 1001, 1002, 1003, 1010, 1011, 1012, 1013, 1020 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`a(6)=12 belongs to the sequence since writing 12^2 = 144 backwards gives 441 = 21^2.`
	MATHEMATICA	`Select[Range[1000], IntegerQ[Sqrt[FromDigits[Reverse[IntegerDigits[ #^2]]]]] &]`
	CROSSREFS	`Cf. A002942.` `Sequence in context: A074068 A055655 A007090 this_sequence A123977 A069967 A061909` `Adjacent sequences: A102856 A102857 A102858 this_sequence A102860 A102861 A102862`
	KEYWORD	`base,easy,nonn`
	AUTHOR	`Sanita Kashcheyeva (sanits(AT)gmail.com), Mar 01 2005`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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