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A083721 Number of primes greater the greatest prime factor of n but not greater n. 1
0, 0, 0, 1, 0, 1, 0, 3, 2, 1, 0, 3, 0, 2, 3, 5, 0, 5, 0, 5, 4, 3, 0, 7, 6, 3, 7, 5, 0, 7, 0, 10, 6, 4, 7, 9, 0, 4, 6, 9, 0, 9, 0, 9, 11, 5, 0, 13, 11, 12, 8, 9, 0, 14, 11, 12, 8, 6, 0, 14, 0, 7, 14, 17, 12, 13, 0, 12, 10, 15, 0, 18, 0, 9, 18, 13, 16, 15, 0, 19, 20, 9, 0, 19, 16, 9, 13, 18, 0, 21, 18 (list; graph; refs; listen; history; internal format)
OFFSET

1,8

COMMENTS

a(n) = A000720(n) - A000720(A006530(n));

n>1: a(n) = 0 iff n is prime.

CROSSREFS

Cf. A083722, A079067.

Sequence in context: A023445 A068494 A195040 * A158459 A031251 A194885

Adjacent sequences:  A083718 A083719 A083720 * A083722 A083723 A083724

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 04 2003

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Last modified February 14 10:16 EST 2012. Contains 205614 sequences.