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A034990
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a(n)^2 is smallest square starting with a string of n 'digit_7's.
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2
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27, 88, 882, 8819, 278886, 881917, 8819171, 8819171, 2788866754, 2788866755, 27888667551, 881917103688, 8819171036882, 278886675511358, 2788866755113584, 27888667551135851, 88191710368819686, 278886675511358516, 8819171036881968635, 8819171036881968635
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| David Wells, 'Curious and Interesting Numbers', Penguin Books 1988, p. 184.
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EXAMPLE
| a(5) = 278886^2 = {77777}400996.
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CROSSREFS
| Cf. A034991.
Sequence in context: A028993 A007266 A098320 * A090949 A046735 A043434
Adjacent sequences: A034987 A034988 A034989 * A034991 A034992 A034993
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KEYWORD
| nonn,base
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), Nov 15 1998.
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EXTENSIONS
| More terms from Francisco Salinas (franciscodesalinas(AT)hotmail.com), Dec 23 2001
a(18) corrected and a(19), a(20) added by John Tomko, Nov 14 2006
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