id:A076473 - OEIS Search Results

Search: id:A076473

Displaying 1-1 of 1 results found.

page 1

Number of pairs (p,q) of successive primes with p+q<=n and gcd(p+q,n)=1.

+0
3

0, 0, 0, 0, 0, 1, 1, 1, 2, 0, 2, 1, 3, 1, 1, 1, 3, 1, 4, 0, 2, 1, 4, 1, 4, 1, 2, 1, 5, 0, 6, 1, 2, 1, 4, 1, 7, 1, 2, 0, 7, 1, 8, 1, 1, 1, 8, 1, 7, 0, 2, 1, 9, 1, 7, 1, 3, 1, 9, 0, 10, 1, 3, 1, 6, 1, 10, 1, 4, 0, 11, 1, 11, 1, 3, 1, 10, 1, 12, 0, 4, 1, 12, 1, 9, 1, 4, 1, 13, 0, 10, 1, 4, 1, 10, 1, 14, 1, 4 (list; graph; listen)

	OFFSET	`1,9`
	COMMENT	`a(n) = A076471(n) - A076472(n).`
	EXAMPLE	`n=27: gcd(2+3,27)=1, gcd(3+5,27)=1, gcd(5+7,27)=3, gcd(7+11,27)=9, gcd(11+13,27)=3, hence a(27)=2.`
	CROSSREFS	`Cf. A000010.` `Sequence in context: A082023 A078152 A028932 this_sequence A163160 A029240 A025803` `Adjacent sequences: A076470 A076471 A076472 this_sequence A076474 A076475 A076476`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 14 2002`

page 1

Search completed in 0.002 seconds

Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

AT&T Labs Research