id:A118886 - OEIS Search Results

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Numbers expressible as i^2+i*j+j^2, 0<=i<=j, in 2 or more ways.

+0
2

49, 91, 133, 147, 169, 196, 217, 247, 259, 273, 301, 343, 361, 364, 399, 403, 427, 441, 469, 481, 507, 511, 532, 553, 559, 588, 589, 637, 651, 676, 679, 703, 721, 741, 763, 777, 784, 793, 817, 819, 868, 871, 889, 903, 931, 949, 961, 973, 988, 1027, 1029, 1036 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Squares of distances between two points in the triangular lattice in two or more nontrivially different ways.`
	FORMULA	`Numbers whose prime factorization contains at least two (not necessarily distinct) primes congruent to 1 mod 6, and any prime factor congruent to 2 mod 3 has even multiplicity. Products of two elements of A024606.`
	CROSSREFS	`Cf. A024606, A118882.` `Sequence in context: A006832 A093894 A090825 this_sequence A108164 A020158 A084632` `Adjacent sequences: A118883 A118884 A118885 this_sequence A118887 A118888 A118889`
	KEYWORD	`nonn`
	AUTHOR	`Frank Adams-Watters (FrankTAW(AT)Netscape.net), May 03 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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