id:A079067 - OEIS Search Results

Search: id:A079067

Displaying 1-1 of 1 results found.

page 1

Number of primes less than greatest prime factor of n but not dividing n.

+0
4

0, 0, 1, 0, 2, 0, 3, 0, 1, 1, 4, 0, 5, 2, 1, 0, 6, 0, 7, 1, 2, 3, 8, 0, 2, 4, 1, 2, 9, 0, 10, 0, 3, 5, 2, 0, 11, 6, 4, 1, 12, 1, 13, 3, 1, 7, 14, 0, 3, 1, 5, 4, 15, 0, 3, 2, 6, 8, 16, 0, 17, 9, 2, 0, 4, 2, 18, 5, 7, 1, 19, 0, 20, 10, 1, 6, 3, 3, 21, 1, 1, 11, 22, 1, 5, 12, 8, 3, 23, 0, 4, 7, 9, 13, 6, 0 (list; graph; listen)

	OFFSET	`1,5`
	COMMENT	`a(n) = A049084(A006530(n))-A001221(n) = A061395(n)-A001221(n);` `a(A000040(k)) = a(A000961(k)) = k - 1;` `a(n) = 0 iff n=m*p(k)#, where p(k)# is the k-th primorial (A002110(k)) and A006530(m)<=A000040(k).`
	CROSSREFS	`Cf. A079068.` `Sequence in context: A135523 A135685 A164658 this_sequence A160271 A065134 A088673` `Adjacent sequences: A079064 A079065 A079066 this_sequence A079068 A079069 A079070`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 20 2002`

page 1

Search completed in 0.002 seconds

Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

AT&T Labs Research