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Search: id:A048354
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| A048354 |
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a(n)^2 is the smallest square containing exactly n 9's. |
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+0
2
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| 3, 63, 173, 1414, 17313, 53937, 138923, 953937, 3082207, 31622764, 99849687, 301579177, 3033150173, 14142134563, 141413973847, 543315746063
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Eric Weisstein's World of Mathematics, Square Number
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MATHEMATICA
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a[n_]:=Module[{i}, i=1; While[DigitCount[i^2][[9]]!=n, i++ ]; i]; - Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 23 2006
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CROSSREFS
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Cf. A036516, A034994.
Sequence in context: A135444 A087886 A123754 this_sequence A046181 A151993 A120053
Adjacent sequences: A048351 A048352 A048353 this_sequence A048355 A048356 A048357
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KEYWORD
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nonn,base,more
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AUTHOR
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Patrick De Geest (pdg(AT)worldofnumbers.com), Mar 15 1999.
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EXTENSIONS
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a(13)-a(15) from Jon E. Schoenfield (jonscho(AT)hiwaay.net), Jan 24 2009
a(16) from Jon E. Schoenfield (jonscho(AT)hiwaay.net), Jan 25 2009
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