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Search: id:A061457
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| A061457 |
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Numbers n such that n and its reversal are both squares. |
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+0
3
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| 0, 1, 4, 9, 100, 121, 144, 169, 400, 441, 484, 676, 900, 961, 1089, 9801, 10000, 10201, 10404, 10609, 12100, 12321, 12544, 12769, 14400, 14641, 14884, 16900, 40000, 40401, 40804, 44100, 44521, 44944, 48400, 48841, 67600, 69696, 90000, 90601
(list; graph; listen)
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OFFSET
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1,3
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,1000
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EXAMPLE
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169 and 961 are both squares.
1089 = 33^2 and 9801 = 99^2 so 1089 belongs to the sequence.
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PROGRAM
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(PARI) { n=0; for (m=0, 1110100, x=m^2; r=0; while (x>0, d=x-10*(x\10); x\=10; r=r*10 + d); if (issquare(r), write("b061457.txt", n++, " ", m^2)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 23 2009]
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CROSSREFS
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Sequence in context: A115551 A115690 A115689 this_sequence A069707 A129967 A087553
Adjacent sequences: A061454 A061455 A061456 this_sequence A061458 A061459 A061460
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KEYWORD
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nonn,base,easy
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), May 03 2001
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EXTENSIONS
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More terms from Larry Reeves (larryr(AT)acm.org), May 17 2001
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