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Search: id:A048352
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| A048352 |
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a(n)^2 is the smallest square containing exactly n 7's. |
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+0
2
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| 24, 76, 424, 3576, 8819, 88924, 278874, 2116076, 8819154, 61463576, 277450424, 526087234, 1943470576, 21858013924, 199694210926, 260341642412
(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 = 1}, While[DigitCount[i^2][[7]] != n, i++ ]; i]; - Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 22 2006
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CROSSREFS
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Cf. A036514, A034990.
Sequence in context: A042134 A045249 A033572 this_sequence A144459 A124140 A143839
Adjacent sequences: A048349 A048350 A048351 this_sequence A048353 A048354 A048355
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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(16) from Jon E. Schoenfield (jonscho(AT)hiwaay.net), Jan 24 2009
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