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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A048147 Array T read by diagonals; T(i,j) = i^2 + j^2. 6
 0, 1, 1, 4, 2, 4, 9, 5, 5, 9, 16, 10, 8, 10, 16, 25, 17, 13, 13, 17, 25, 36, 26, 20, 18, 20, 26, 36, 49, 37, 29, 25, 25, 29, 37, 49, 64, 50, 40, 34, 32, 34, 40, 50, 64, 81, 65, 53, 45, 41, 41, 45, 53, 65, 81, 100, 82, 68, 58, 52, 50, 52, 58, 68 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 COMMENTS For any i,j >=0 a(i)*a(j) is a member of this sequence, since (a^2 + b^2)*(c^2 + d^2) = (a*c + b*d)^2 + (a*d - b*c)^2. - Boris Putievskiy, May 05 2013 LINKS Table of n, a(n) for n=0..63. EXAMPLE Diagonals (each starting on row 1): {0}; {1,1}; {4,2,4}; ... CROSSREFS Cf. A006331. Sequence in context: A137718 A007361 A128136 * A203001 A051666 A011382 Adjacent sequences: A048144 A048145 A048146 * A048148 A048149 A048150 KEYWORD nonn,tabl AUTHOR Clark Kimberling 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.

Last modified June 16 16:45 EDT 2024. Contains 373432 sequences. (Running on oeis4.)