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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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1
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24, 76, 424, 3576, 8819, 88924, 278874, 2116076, 8819154, 61463576, 277450424, 526087234, 1943470576, 21858013924, 199694210926, 260341642412
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Eric Weisstein's World of Mathematics, Square Number
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MATHEMATICA
| 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
| Cf. A036514, A034990.
Sequence in context: A185940 A033572 A195027 * A144459 A206010 A124140
Adjacent sequences: A048349 A048350 A048351 * A048353 A048354 A048355
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KEYWORD
| nonn,base,more
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), Mar 15 1999.
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EXTENSIONS
| a(13)-a(16) from Jon E. Schoenfield (jonscho(AT)hiwaay.net), Jan 24 2009
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