id:A102820 - OEIS Search Results

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Number of primes between 2*p(n) and 2*p(n+1), where p(n) is the n-th prime.

+0
3

1, 1, 2, 2, 1, 2, 1, 2, 2, 2, 3, 1, 1, 1, 3, 3, 0, 2, 2, 0, 3, 1, 2, 4, 2, 0, 1, 0, 1, 6, 1, 3, 1, 3, 0, 3, 1, 1, 1, 3, 1, 3, 1, 1, 1, 4, 4, 1, 1, 2, 1, 1, 3, 2, 2, 0, 1, 1, 1, 1, 3, 6, 2, 0, 1, 6, 1, 3, 0, 1, 1, 3, 2, 2, 1, 2, 1, 1, 2, 4, 1, 3, 1, 1, 2, 1, 2, 1, 0, 1, 4, 2, 1, 3, 0, 2, 5, 0, 5, 3, 3, 2, 1, 0, 2 (list; graph; listen)

	OFFSET	`1,3`
	EXAMPLE	`a(15)=3 because there are 3 primes between the doubles of the 15th and 16th primes, that is between 247 and 2 53.`
	MATHEMATICA	`MyA102820=Table[PrimePi[2 Prime[n+1]]-PrimePi[2 Prime[n]], {n, 150}] (Seidov)` `f[n_] := PrimePi[2Prime[n + 1]] - PrimePi[2Prime[n]]; Table[ f[n], {n, 105}] (from Robert G. Wilson v Mar 03 2005)`
	CROSSREFS	`Cf. A104380.` `Sequence in context: A091267 A003643 A058062 this_sequence A024317 A024880 A029424` `Adjacent sequences: A102817 A102818 A102819 this_sequence A102821 A102822 A102823`
	KEYWORD	`easy,nonn`
	AUTHOR	`Ali A. Tanara (tanara(AT)khayam.ut.ac.ir), Feb 27 2005`
	EXTENSIONS	`More terms from Zak Seidov (zakseidov(AT)yahoo.com), Feb 28 2005`

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Last modified September 7 15:23 EDT 2008. Contains 143483 sequences.

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