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Search: id:A092850
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| 2, 12, 81, 598, 4708, 38622, 327823, 2847315, 25163920, 225457188, 2042143752, 18663517814, 171846353051
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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a(n) = PrimePi(10^n)-PrimePi(A092800(n)) = PrimePi(10^n)-PrimePi(A046731(n)/A006880(n)). - Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2007
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EXAMPLE
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Below 10^1 there are 4 primes: 2+3+5+7=17. The rounded mean is 17/4 =~ 4. There are 2 primes > 4: 5 and 7, so a(1)=2.
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CROSSREFS
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Cf. A092800, A092849, A092851.
Sequence in context: A052822 A058872 A055548 this_sequence A052864 A130464 A006657
Adjacent sequences: A092847 A092848 A092849 this_sequence A092851 A092852 A092853
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KEYWORD
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nonn
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AUTHOR
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Enoch Haga (Enokh(AT)comcast.net), Mar 07 2004
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EXTENSIONS
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a(9)-a(13) from Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2007
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