id:A047847 - OEIS Search Results

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n + (n+1) and (n+2) + (n+3) both prime.

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3

1, 3, 6, 9, 18, 21, 33, 39, 48, 51, 54, 63, 81, 96, 111, 114, 138, 153, 156, 174, 189, 198, 219, 228, 231, 243, 249, 306, 321, 336, 369, 378, 384, 411, 426, 429, 438, 441, 453, 468, 483, 504, 543, 546, 606, 639, 648, 651, 711, 714, 723, 741, 744, 774, 783, 789 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n) =(A046132(n)-5)/2 =(A023200(n)-1)/2 =3*A056956(n-1)`
	EXAMPLE	`If n = 6, then 6 + 7 = 13 and 8 + 9 = 17 are both prime.`
	CROSSREFS	`Cf. A005097, A014545.` `Sequence in context: A070120 A070126 A127644 this_sequence A007783 A050625 A025614` `Adjacent sequences: A047844 A047845 A047846 this_sequence A047848 A047849 A047850`
	KEYWORD	`easy,nonn`
	AUTHOR	`Enoch Haga (Enokh(AT)comcast.net)`
	EXTENSIONS	`Corrected by Henry Bottomley (se16(AT)btinternet.com), Jul 18 2000`

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Last modified September 7 12:28 EDT 2008. Contains 143483 sequences.

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