A079067 - OEIS

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A079067

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

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; refs; listen; history; internal format)

	OFFSET	`1,5`
	COMMENTS	`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: A194663 A135685 A164658 * A160271 A065134 A088673` `Adjacent sequences: A079064 A079065 A079066 * A079068 A079069 A079070`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 20 2002`

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Last modified February 13 13:55 EST 2012. Contains 205493 sequences.