id:A034017 - OEIS Search Results

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Numbers that are primitively represented by x^2+xy+y^2.

+0
4

0, 1, 3, 7, 13, 19, 21, 31, 37, 39, 43, 49, 57, 61, 67, 73, 79, 91, 93, 97, 103, 109, 111, 127, 129, 133, 139, 147, 151, 157, 163, 169, 181, 183, 193, 199, 201, 211, 217, 219, 223, 229, 237, 241, 247, 259, 271, 273, 277, 283, 291, 301, 307, 309 (list; graph; listen)

	OFFSET	`1,3`
	REFERENCES	`B. C. Berndt & R. A. Rankin, Ramanujan: Letters and Commentary, see p. 184, AMS Providence RI 1995.`
	LINKS	`Linda Stannard, Principles of Virus Architecture`
	FORMULA	`3^{0 or 1} X product of primes of form 3a+1 to any power.`
	CROSSREFS	`Cf. A003136, A045611, A045897.` `Sequence in context: A032437 A076746 A118667 this_sequence A034021 A038978 A133387` `Adjacent sequences: A034014 A034015 A034016 this_sequence A034018 A034019 A034020`
	KEYWORD	`nonn`
	AUTHOR	`njas`

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Last modified August 29 17:10 EDT 2008. Contains 143238 sequences.

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