id:A153238 - OEIS Search Results

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Numbers n such that 2n+3 is not prime.

+0
20

3, 6, 9, 11, 12, 15, 16, 18, 21, 23, 24, 26, 27, 30, 31, 33, 36, 37, 39, 41, 42, 44, 45, 46, 48, 51, 54, 56, 57, 58, 59, 60, 61, 63, 65, 66, 69, 70, 71, 72, 75, 76, 78, 79, 81, 83, 84, 86, 87, 90, 91, 92, 93, 96, 99, 100, 101, 102, 103, 105, 106, 107, 108, 109, 111, 114 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`Vincenzo Librandi, Triangolo Librandi e numeri primi`
	FORMULA	`Let p=prime number; n=(p^2-3)/2 mod (p)`
	MATHEMATICA	`lst={}; Do[If[ !PrimeQ[2*n+3], AppendTo[lst, n]], {n, 6!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Jan 10 2009]`
	CROSSREFS	`Cf. A067076, A144562` `Sequence in context: A024795 A000408 A025321 this_sequence A086883 A154777 A094740` `Adjacent sequences: A153235 A153236 A153237 this_sequence A153239 A153240 A153241`
	KEYWORD	`nonn`
	AUTHOR	`Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Dec 21 2008`
	EXTENSIONS	`Edited by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jan 07 2009`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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