id:A139830 - OEIS Search Results

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Primes of the form 7x^2+6xy+7y^2.

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3

7, 23, 47, 103, 127, 167, 223, 263, 367, 383, 463, 487, 503, 607, 647, 727, 743, 823, 863, 887, 967, 983, 1063, 1087, 1103, 1223, 1303, 1327, 1367, 1423, 1447, 1487, 1543, 1567, 1583, 1607, 1663, 1783, 1823, 1847, 2063, 2087, 2143, 2207, 2287 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Discriminant=-160. See A139827 for more information.` `Also primes of the forms 7x^2+2xy+23y^2 and 7x^2+4xy+12y^2. See A140633. - T. D. Noe (noe(AT)sspectra.com), May 19 2008`
	FORMULA	`The primes are congruent to {7, 23} (mod 40).`
	CROSSREFS	`Sequence in context: A139035 A002146 A073577 this_sequence A101789 A062725 A098334` `Adjacent sequences: A139827 A139828 A139829 this_sequence A139831 A139832 A139833`
	KEYWORD	`nonn,easy`
	AUTHOR	`T. D. Noe (noe(AT)sspectra.com), May 02 2008`

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Last modified August 28 22:44 EDT 2008. Contains 143251 sequences.

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