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A137588
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Number of primes not greater than n that are greater than the number of primes not greater than n.
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4
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0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,7
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COMMENTS
| a(n) = #{p prime: A000720(n)<p<=n} = A000720(n)-A132090(n);
a(A007821(n)) = n.
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LINKS
| R. Zumkeller, Table of n, a(n) for n = 1..10000
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EXAMPLE
| n=100: A000720(100)=25,
a(100)=#{29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97}=16.
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MATHEMATICA
| Table[PrimePi[n]-PrimePi[PrimePi[n]], {n, 90}] (* From Harvey P. Dale, Mar 20 2011 *)
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CROSSREFS
| Sequence in context: A147583 A054895 A194699 * A033271 A004052 A051742
Adjacent sequences: A137585 A137586 A137587 * A137589 A137590 A137591
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KEYWORD
| nonn
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AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jan 28 2008
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