OFFSET
1,1
COMMENTS
n-1 2's followed by a 7.
LINKS
Markus Tervooren, Factorizations of (2)w7
Index entries for linear recurrences with constant coefficients, signature (11,-10).
FORMULA
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
From Colin Barker, Jan 24 2013: (Start)
a(n) = 11*a(n-1)-10*a(n-2).
G.f.: -x*(50*x-7)/((x-1)*(10*x-1)). (End)
MATHEMATICA
Table[FromDigits[PadLeft[{7}, n, 2]], {n, 20}] (* or *) LinearRecurrence[{11, -10}, {7, 27}, 20] (* Harvey P. Dale, Jan 06 2023 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Ivan Panchenko, Feb 12 2010
EXTENSIONS
More terms from Vincenzo Librandi, Feb 24 2010
STATUS
approved