id:A046711 - OEIS Search Results

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From the Bruck-Ryser theorem: n == 1 or 2 (mod 4) which are also the sum of 2 squares.

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1, 2, 5, 9, 10, 13, 17, 18, 25, 26, 29, 34, 37, 41, 45, 49, 50, 53, 58, 61, 65, 73, 74, 81, 82, 85, 89, 90, 97, 98, 101, 106, 109, 113, 117, 121, 122, 125, 130, 137, 145, 146, 149, 153, 157, 162, 169, 170, 173, 178, 181, 185, 193, 194, 197, 202, 205, 218, 221, 225 (list; graph; listen)

	OFFSET	`1,2`
	REFERENCES	`R. H. Bruck and H. J. Ryser, The nonexistence of certain projective planes, Canad. J. Math., 1 (1949), 88-93.` `M. Hall, Jr., Combinatorial Theory, Theorem 12.3.2.`
	LINKS	`Index entries for sequences related to sums of squares`
	CROSSREFS	`Sequence in context: A078360 A114995 A047619 this_sequence A095347 A159073 A088343` `Adjacent sequences: A046708 A046709 A046710 this_sequence A046712 A046713 A046714`
	KEYWORD	`nonn,easy,nice`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`
	EXTENSIONS	`More terms from James A. Sellers (sellersj(AT)math.psu.edu)`

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

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