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 A221669 3 x 3 magic square containing seven squares, read by rows. 5
 139129, 83521, 319225, 360721, 180625, 529, 42025, 277729, 222121 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Apart from trivial modifications, this is the only known 3 x 3 magic square containing seven squares. No 3 x 3 magic square containing eight or nine squares is known. The seven integer square roots are A221670. LINKS A. Bremner, On squares of squares, Acta Arith. 88 (1999), 289-297. A. Bremner, On squares of squares. II, Acta Arith. 99 (2001), 289-308. John P. Robertson, Magic squares of squares, Math. Mag., 69 (1996), 289-293. Zentralblatt, Review of "On squares of squares. II" by A. Bremner FORMULA a(1) = 139129 = 373^2, a(2) = 83521 = 289^2, a(3) = 319225 = 565^2, a(5) = 180625 = 425^2, a(6) = 529 = 23^2, a(7) = 42025 = 205^2, a(8) = 277729 = 527^2. EXAMPLE [139129 83521 319225 360721 180625 529 42025 277729 222121] CROSSREFS Cf. A221670, A319589. Sequence in context: A250713 A236063 A234821 * A145207 A236745 A205213 Adjacent sequences:  A221666 A221667 A221668 * A221670 A221671 A221672 KEYWORD nonn,tabf,fini,full AUTHOR Jonathan Sondow, Jan 21 2013 STATUS approved

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Last modified May 28 16:37 EDT 2022. Contains 354119 sequences. (Running on oeis4.)