login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A120681 Sum of legs of primitive Pythagorean triangles sorted first on hypotenuse, then long leg. 9
7, 17, 23, 31, 41, 47, 49, 73, 71, 89, 79, 103, 113, 97, 119, 137, 119, 151, 127, 161, 193, 167, 161, 191, 217, 239, 217, 199, 257, 233, 263, 223, 289, 271, 311, 241, 281, 313, 329, 287, 343, 287, 329, 367, 391, 401, 353, 431, 409, 337, 383, 457, 359, 463, 479 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The prime numbers congruent to +1 or -1 modulo 8 of this sequence appear exactly once. For a proof see the W. Lang link under A001132. - Wolfdieter Lang, Feb 17 2015

LINKS

Ray Chandler, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A046087(n) + A046086(n).

MATHEMATICA

A[s_Integer] := With[{s6 = StringPadLeft[ToString[s], 6, "0"]}, Cases[ Import["https://oeis.org/A" <> s6 <> "/b" <> s6 <> ".txt", "Table"], {_, _}][[All, 2]]];

A046086 = A@046086;

A046087 = A@046087;

a[n_] := A046087[[n]] + A046086[[n]];

a /@ Range[10000] (* Jean-Fran├žois Alcover, Mar 07 2020 *)

CROSSREFS

Cf. A120682, A058529, A118905, A198390, A001132, A046086, A046087.

Sequence in context: A198441 A058529 A253408 * A270951 A001132 A308816

Adjacent sequences:  A120678 A120679 A120680 * A120682 A120683 A120684

KEYWORD

nonn

AUTHOR

Lekraj Beedassy, Jun 24 2006

EXTENSIONS

Edited and corrected by Ray Chandler, Apr 10 2010

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 4 01:57 EDT 2020. Contains 336201 sequences. (Running on oeis4.)