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Search: id:A128910
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| 0, 3, 20, 119, 715, 4523, 30509, 213343, 1530983, 11203550, 83064263, 620498643, 4643259527, 34592032908, 254639722327, 1832740718223, 12680919388801, 81678704122892, 452951221016511, 1574800035301944, 8395299939524712
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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This is an improvement over the classic X/lnX approximation
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EXAMPLE
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a(10)=11203550 via abs (455,052,511 - 443,848,961)
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MATHEMATICA
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(courtesy of Robert G Wilson) Table[ PrimePi[10^n] - Round[N[1.022*10^n/Log[10^n]]], {n, 23}] and absolute value thereof (orig entries 21-23 <0)
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CROSSREFS
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Cf. A057835, A006880.
Sequence in context: A108911 A005096 A001652 this_sequence A037788 A037669 A009125
Adjacent sequences: A128907 A128908 A128909 this_sequence A128911 A128912 A128913
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KEYWORD
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easy,nonn
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AUTHOR
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Bill R McEachen (bmceache(AT)centralsan.dst.ca.us), Apr 23 2007
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