id:A121068 - OEIS Search Results

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Numbers n such that 8*n^2 + 7 is prime.

+0
2

0, 3, 27, 30, 33, 48, 57, 60, 72, 75, 78, 108, 117, 123, 135, 150, 162, 192, 198, 207, 228, 243, 270, 300, 303, 312, 342, 345, 390, 408, 417, 423, 435, 480, 498, 507, 510, 513, 543, 552, 555, 573, 618, 633, 642, 645, 657, 675, 705, 723, 732, 738, 747, 750, 780 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`All terms are multiples of 3. - Zak Seidov, Aug 11 2006.`
	EXAMPLE	`If n=135 then 8*n^2 + 7 = 145807 (prime).`
	MAPLE	`a:=proc(n) if isprime(8*n^2+7)=true then n else fi end: seq(a(n), n=0..1000); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Aug 11 2006`
	CROSSREFS	`Cf. A007522.` `Adjacent sequences: A121065 A121066 A121067 this_sequence A121069 A121070 A121071` `Sequence in context: A088730 A058956 A010257 this_sequence A136895 A034594 A077533`
	KEYWORD	`nonn`
	AUTHOR	`Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Aug 10 2006`
	EXTENSIONS	`More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu) and Joshua Zucker (joshua.zucker(AT)stanfordalumni.org), Aug 11 2006`

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Last modified October 11 13:47 EDT 2008. Contains 144830 sequences.

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