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Search: id:A023110
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| A023110 |
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Numbers n such that n remains square when last digit is removed. |
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+0
10
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| 1, 4, 9, 16, 49, 169, 256, 361, 1444, 3249, 18496, 64009, 237169, 364816, 519841, 2079364, 4678569, 26666896, 92294449, 341991049, 526060096, 749609641, 2998438564, 6746486769, 38453641216, 133088524969, 493150849009
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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Appears to satisfy a(n)=1444a(n-7)+a(n-14)-76*sqrt(a(n-7)*a(n-14)) which would require a(-k) to look like 16, 49, 169, 256, 3249, 1444, 361, 18496, ... for k>0. - Henry Bottomley (se16(AT)btinternet.com), May 08 2001
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CROSSREFS
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Cf. A053784.
Cf. A031149, A055792, A055793, A055808, A055812, A055851, A055859, A055872.
Sequence in context: A112735 A059931 A027382 this_sequence A073723 A030075 A038784
Adjacent sequences: A023107 A023108 A023109 this_sequence A023111 A023112 A023113
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KEYWORD
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nonn,base
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AUTHOR
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David W. Wilson (davidwwilson(AT)comcast.net)
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