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Search: id:A061536
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| A061536 |
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a(n) = a(n-1) + the number of primes <= n. |
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+0
1
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| 1, 2, 4, 6, 9, 12, 16, 20, 24, 28, 33, 38, 44, 50, 56, 62, 69, 76, 84, 92, 100, 108, 117, 126, 135, 144, 153, 162, 172, 182, 193, 204, 215, 226, 237, 248, 260, 272, 284, 296, 309, 322, 336, 350, 364, 378, 393, 408, 423, 438, 453, 468, 484, 500, 516, 532, 548
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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a[1] = 1; a[n_] := a[n - 1] + PrimePi[n]; Table[ a[n], {n, 1, 70} ]
Partial sums of A000720. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 03 2009]
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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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PROGRAM
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(PARI) { a=1; for (n=1, 1000, write("b061536.txt", n, " ", a+=primepi(n)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 24 2009]
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CROSSREFS
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Adjacent sequences: A061533 A061534 A061535 this_sequence A061537 A061538 A061539
Sequence in context: A033291 A105434 A145196 this_sequence A095114 A062048 A075354
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KEYWORD
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nonn
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AUTHOR
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R. K. Guy, Robert G. Wilson v (rgwv(AT)rgwv.com), May 14 2001
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