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A048351
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a(n)^2 is the smallest square containing exactly n 6's.
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2
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4, 26, 216, 1291, 5164, 68313, 163284, 785294, 3559026, 26393686, 129099069, 254296413, 816435342, 4081257976, 80413106314, 215329205326
(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][[6]] != n, i++; ]; i]; - Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 20 2006
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CROSSREFS
| Cf. A036513, A034988.
Sequence in context: A124554 A206391 A164101 * A143436 A135884 A120971
Adjacent sequences: A048348 A048349 A048350 * A048352 A048353 A048354
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KEYWORD
| nonn,base
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), Mar 15 1999.
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EXTENSIONS
| 816435342 from Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 20 2006
a(14), a(15) from Jon E. Schoenfield, Jan 14 2009
a(16) from Jon E. Schoenfield (jonscho(AT)hiwaay.net), Jan 24 2009
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