id:A088700 - OEIS Search Results

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Number of primes between successive semiprimes.

+0
8

1, 1, 0, 2, 0, 2, 0, 1, 0, 2, 0, 0, 1, 0, 2, 1, 0, 1, 0, 0, 2, 0, 1, 2, 0, 1, 1, 0, 0, 1, 0, 0, 0, 3, 2, 1, 0, 0, 0, 0, 0, 1, 1, 0, 2, 0, 0, 0, 0, 2, 1, 0, 0, 1, 1, 1, 0, 2, 0, 0, 2, 2, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 3, 0, 2, 0, 1, 0, 1, 0, 1, 0, 2, 1, 2, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 2, 1, 0, 0 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`a(n) = A000720(A001358(n+1)) - A000720(A001358(n));` `a(A088701(n))=n and a(k)<>n for 1<=k<A088701(n).`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..1000` `Eric Weisstein's World of Mathematics, Prime Counting Function` `Eric Weisstein's World of Mathematics, Semiprime`
	EXAMPLE	`a(34)=3, as there are three primes between A001358(34)=195=95` `and A001358(34+1)=532=106: 97, 101 and 103.`
	CROSSREFS	`Cf. A103668 (semiprimes between primes)` `Sequence in context: A039974 A039973 A035171 this_sequence A035446 A126211 A095414` `Adjacent sequences: A088697 A088698 A088699 this_sequence A088701 A088702 A088703`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 08 2003`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

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