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Search: id:A086936
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| A086936 |
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Number of primes between n and p(n) inclusive. |
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+0
1
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| 1, 2, 2, 2, 3, 3, 4, 4, 5, 6, 7, 7, 8, 8, 9, 10, 11, 11, 12, 12, 13, 14, 15, 15, 16, 17, 18, 19, 20, 20, 21, 21, 22, 23, 24, 25, 26, 26, 27, 28, 29, 29, 30, 30, 31, 32, 33, 33, 34, 35, 36, 37, 38, 38, 39, 40, 41, 42, 43, 43, 44, 44, 45, 46, 47, 48, 49, 49, 50, 51, 52, 52, 53, 53
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Or number of nonprimes A141468<n. [From Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Nov 19 2009]
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FORMULA
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a(n)=sum{k=0..n, (1+mu(if(prime(k), k, 1)))/2} [offset 0] - Paul Barry (pbarry(AT)wit.ie), May 10 2005
a(n)=1+n-A000720(n). [From Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Nov 19 2009]
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CROSSREFS
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Sequence in context: A060970 A035429 A018117 this_sequence A094990 A120178 A120179
Cf. A000027, A000720, A141468. [From Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Nov 19 2009]
Adjacent sequences: A086933 A086934 A086935 this_sequence A086937 A086938 A086939
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KEYWORD
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easy,nonn,new
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Sep 22 2003
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