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Search: id:A061568
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| A061568 |
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Number of primes <= sum of first n primes. |
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+0
1
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| 1, 3, 4, 7, 9, 13, 16, 21, 25, 31, 37, 45, 51, 60, 66, 75, 85, 95, 103, 115, 127, 138, 150, 162, 177, 191, 205, 219, 233, 250, 267, 283, 300, 319, 338, 360, 376, 400, 421, 441, 461, 481, 509, 531, 557, 578, 602, 630, 653, 684
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,1000
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MATHEMATICA
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PrimePi/@FoldList[Plus, 0, Prime[Range[50]]]//Rest
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PROGRAM
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(PARI) { default(primelimit, 3682913); n=0; s=0; forprime (p=2, prime(1000), s+=p; write("b061568.txt", n++, " ", primepi(s)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 24 2009]
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CROSSREFS
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Cf. A000849.
Sequence in context: A072441 A152032 A004652 this_sequence A146994 A103054 A140208
Adjacent sequences: A061565 A061566 A061567 this_sequence A061569 A061570 A061571
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KEYWORD
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easy,nonn
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AUTHOR
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Harvey P. Dale (hpd1(AT)nyu.edu), May 18 2001
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