id:A101264 - OEIS Search Results

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a(n) = 1 iff 2*n+1 is prime, else a(n) = 0.

+0
3

0, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`Taking the inverse Moebius transform produces an interesting sequence! - Jonathan Vos Post, Dec 19 2004`
	FORMULA	`a(n) = A057427(A085090(n+1)). - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Sep 14 2006`
	EXAMPLE	`a(1) = 1 because 21+1 = 3 is prime;` `a(2) = 1 because 22+1 = 5 is prime;` `a(3) = 1 because 23+1 = 7 is prime;` `a(4) = 0 because 24+1 = 9 is composite;`
	MATHEMATICA	`Table[If[PrimeQ[2n + 1], 1, 0], {n, 0, 104}] (Ray Chandler)`
	CROSSREFS	`Bisection of A010051 (the other bisection is A063524).` `Cf. A065091.` `Adjacent sequences: A101261 A101262 A101263 this_sequence A101265 A101266 A101267` `Sequence in context: A095076 A130854 A112448 this_sequence A095770 A140318 A060584`
	KEYWORD	`easy,nonn`
	AUTHOR	`Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Dec 18 2004`
	EXTENSIONS	`Corrected by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jan 09 2005`

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Last modified October 13 02:37 EDT 2008. Contains 145008 sequences.

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