login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A156845 12167n - 8579. 4
3588, 15755, 27922, 40089, 52256, 64423, 76590, 88757, 100924, 113091, 125258, 137425, 149592, 161759, 173926, 186093, 198260, 210427, 222594, 234761, 246928, 259095, 271262, 283429, 295596, 307763, 319930, 332097, 344264, 356431, 368598 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
The identity (279841*n^2-394634*n+139128)^2-(529*n^2-746*n+263)*(12167*n-8579)^2=1 can be written as A156844(n)^2-A156842(n)*a(n)^2=1.
LINKS
FORMULA
a(n) = 2*a(n-1) -a(n-2).
G.f.: x*(3588+8579*x)/(x-1)^2.
MATHEMATICA
LinearRecurrence[{2, -1}, {3588, 15755}, 40]
PROG
(Magma) I:=[3588, 15755]; [n le 2 select I[n] else 2*Self(n-1)-Self(n-2): n in [1..50]];
(PARI) a(n)=a(n)=12167*n-8579 \\ Charles R Greathouse IV, Dec 23 2011
CROSSREFS
Sequence in context: A234138 A249289 A249537 * A174851 A342970 A284970
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Feb 17 2009
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 23 18:16 EDT 2024. Contains 371916 sequences. (Running on oeis4.)