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7, 27, 227, 2227, 22227, 222227, 2222227, 22222227, 222222227, 2222222227, 22222222227, 222222222227, 2222222222227, 22222222222227, 222222222222227, 2222222222222227, 22222222222222227, 222222222222222227
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OFFSET
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1,1
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COMMENTS
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n-1 2's followed by a 7.
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LINKS
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Table of n, a(n) for n=1..18.
Markus Tervooren, Factorizations of (2)w7
Index entries for linear recurrences with constant coefficients, signature (11,-10).
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FORMULA
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a(n) = 10*a(n-1)-43 with n>1, a(1)=7. [Vincenzo Librandi, Dec 05 2010]
a(n) = a(n-1)+2*10^(n-1) with n>1, a(1)=7. [Zak Seidov, Dec 05 2010]
a(n) = 11*a(n-1)-10*a(n-2). G.f.: -x*(50*x-7)/((x-1)*(10*x-1)). [Colin Barker, Jan 24 2013]
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CROSSREFS
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Sequence in context: A192250 A035081 A193257 * A196323 A003148 A033910
Adjacent sequences: A173190 A173191 A173192 * A173194 A173195 A173196
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KEYWORD
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easy,nonn
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AUTHOR
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Ivan Panchenko, Feb 12 2010
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EXTENSIONS
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More terms from Vincenzo Librandi, Feb 24 2010
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STATUS
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approved
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