The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A195531 Hypotenuses of Pythagorean triples in A195499 and A195503. 3
5, 17, 65, 241, 901, 3361, 12545, 46817, 174725, 652081, 2433601, 9082321, 33895685, 126500417, 472105985, 1761923521, 6575588101, 24540428881, 91586127425, 341804080817, 1275630195845, 4760716702561, 17767236614401, 66308229755041 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
See A195500 for discussion and list of related sequences; see A195499 for Mathematica program.
Essentially the same as A120893. - R. J. Mathar, Sep 21 2011
LINKS
FORMULA
Conjecture: a(n) = 3*a(n-1)+3*a(n-2)-a(n-3). G.f.: x*(5+2*x-x^2)/((1+x)*(1-4*x+x^2)). [Colin Barker, Apr 08 2012]
CROSSREFS
Sequence in context: A273793 A196926 A120893 * A273535 A149672 A149673
KEYWORD
nonn
AUTHOR
Clark Kimberling, Sep 20 2011
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 June 17 15:15 EDT 2024. Contains 373449 sequences. (Running on oeis4.)