id:A078119 - OEIS Search Results

Search: id:A078119

Displaying 1-1 of 1 results found.

page 1

sigma(n) - phi(n+2), where sigma = sum of divisors (A000203) and phi = Euler totient function (A000010).

+0
1

-1, 1, 0, 5, 0, 8, 2, 11, 3, 14, 0, 22, 6, 16, 8, 25, 0, 31, 8, 32, 10, 28, 4, 48, 13, 30, 12, 48, 0, 56, 12, 47, 24, 42, 12, 73, 14, 44, 16, 78, 0, 76, 20, 62, 32, 56, 6, 104, 25, 69, 20, 80, 14, 96, 36, 92, 22, 74, 0, 138, 26, 64, 56, 107, 18, 112, 24, 102, 26, 120, 0, 159, 34, 78, 64, 116, 18 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`For n>1: a(n)>=0 and a(n)=0 iff (n,n+2) is a twin prime pair.`
	CROSSREFS	`Cf. A001359, A006512.` `Sequence in context: A124914 A011510 A021667 this_sequence A085998 A094886 A143821` `Adjacent sequences: A078116 A078117 A078118 this_sequence A078120 A078121 A078122`
	KEYWORD	`sign`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 06 2002`

page 1

Search completed in 0.002 seconds

Last modified December 5 08:23 EST 2009. Contains 170348 sequences.

AT&T Labs Research