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A048347
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a(n)^2 is the smallest square containing exactly n 2's.
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1
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5, 15, 149, 1415, 4585, 14585, 105935, 364585, 3496101, 4714045, 34964585, 149305935, 1490725415, 4714469665, 1490711985, 149071333335, 1105537083332, 1489973900149
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| a(19) > 10^13 [From Jon E. Schoenfield (jonscho(AT)hiwaay.net), Dec 25 2008]
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LINKS
| Eric Weisstein's World of Mathematics, Square Number
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EXAMPLE
| Examples from Jon E. Schoenfield (jonscho(AT)hiwaay.net), Dec 25 2008:
a(16) = 149071333335 = sqrt(22222262422274682222225)
a(17) = 1105537083332 = sqrt(1222212242622225512222224)
a(18) = 1489973900149 = sqrt(2220022223125222222222201)
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CROSSREFS
| Cf. A036509, A034980.
Sequence in context: A091096 A116957 A124209 * A034980 A174850 A143048
Adjacent sequences: A048344 A048345 A048346 * A048348 A048349 A048350
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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) from Max Alekseyev (maxale(AT)gmail.com), Oct 20 2008
a(14) from Max Alekseyev (maxale(AT)gmail.com), Nov 10 2008
a(15) from Max Alekseyev (maxale(AT)gmail.com), Dec 05 2008
a(16)-a(18) from Jon E. Schoenfield (jonscho(AT)hiwaay.net), Dec 25 2008
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