id:A088503 - OEIS Search Results

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Numbers n such that (n^2 + 3)/4 is prime.

+0
4

3, 5, 7, 11, 13, 17, 25, 29, 31, 35, 41, 43, 49, 55, 67, 77, 83, 101, 109, 115, 119, 125, 133, 139, 143, 151, 155, 157, 161, 179, 181, 199, 203, 211, 221, 223, 235, 239, 263, 277, 283, 287, 295, 301, 307, 311, 323, 325, 329, 335, 337, 347, 353, 377, 379, 385 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n) = 2*A002384(n+1) + 1 = Sqrt(A110284(n+1)). - Ray Chandler (rayjchandler(AT)sbcglobal.net), Sep 07 2005`
	EXAMPLE	`(25*25 + 3)/4 = 157, 157 is prime, 25 is the 6-th term of the sequence.`
	CROSSREFS	`Cf. A002383, A002384, A110284.` `Sequence in context: A154868 A020628 A108816 this_sequence A118939 A087382 A025127` `Adjacent sequences: A088500 A088501 A088502 this_sequence A088504 A088505 A088506`
	KEYWORD	`easy,nonn`
	AUTHOR	`Pierre CAMI (colettecami(AT)aol.com), Nov 13 2003`
	EXTENSIONS	`Corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Nov 16 2003`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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