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A041760 Numerators of continued fraction convergents to sqrt(401). 3
20, 801, 32060, 1283201, 51360100, 2055687201, 82278848140, 3293209612801, 131810663360180, 5275719744020001, 211160600424160220, 8451699736710428801, 338279150068841312260, 13539617702490362919201, 541922987249683358080300 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
Tanya Khovanova, Recursive Sequences
FORMULA
a(n) = 40*a(n-1)+a(n-2) for n>1, a(0)=20, a(1)=801. G.f.: (20+x)/(1-40*x-x^2). [Philippe Deléham, Nov 23 2008]
MATHEMATICA
Numerator[Convergents[Sqrt[401], 30]] (* Vincenzo Librandi, Nov 07 2013 *)
CROSSREFS
Sequence in context: A267671 A281777 A041763 * A250550 A292417 A117798
KEYWORD
nonn,cofr,frac,easy,less
AUTHOR
STATUS
approved

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Last modified June 24 05:52 EDT 2024. Contains 373661 sequences. (Running on oeis4.)