id:A156878 - OEIS Search Results

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Number of numbers <= n that are neither safe primes and nor Sophie Germain primes.

+0
5

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 9, 9, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11 (list; graph; listen)

	OFFSET	`1,17`
	COMMENT	`a(n) = A000720(n) - A156876(n).`
	LINKS	`R. Zumkeller, Table of n, a(n) for n = 1..10000`
	EXAMPLE	`a(120)=#{13,17,19,31,37,43,61,67,71,73,79,97,10,103,109}=15.`
	CROSSREFS	`A059500, A005384, A005385.` `Sequence in context: A157639 A010096 A063510 this_sequence A140474 A091195 A072375` `Adjacent sequences: A156875 A156876 A156877 this_sequence A156879 A156880 A156881`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Feb 18 2009`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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