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A061465
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Floor(Sum_{k=1..n} sqrt(2k-1)).
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1
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1, 2, 4, 7, 10, 13, 17, 21, 25, 29, 34, 39, 44, 49, 54, 60, 66, 72, 78, 84, 90, 97, 104, 110, 117, 125, 132, 139, 147, 155, 162, 170, 178, 186, 195, 203, 212, 220, 229, 238, 247, 256, 265, 275, 284, 294, 303, 313, 323, 333, 343, 353, 363, 374, 384, 395, 405, 416
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Harry J. Smith, Table of n, a(n) for n=1,...,1000
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EXAMPLE
| a(3)=floor(sqrt(1)+ sqrt(3)+ sqrt(5))= floor(4.968118785068667) = 4.
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PROG
| (PARI) { default(realprecision, 100); for (n=1, 1000, write("b061465.txt", n, " ", floor(sum(k=1, n, sqrt(2*k - 1)))) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 23 2009]
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CROSSREFS
| Sequence in context: A137281 A003067 A130243 * A126022 A194172 A173537
Adjacent sequences: A061462 A061463 A061464 * A061466 A061467 A061468
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KEYWORD
| easy,nonn
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AUTHOR
| Jason Earls (zevi_35711(AT)yahoo.com), Jun 10 2001
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EXTENSIONS
| Corrected description and more terms from Larry Reeves (larryr(AT)acm.org), Jun 12 2001; example correct by Clark Kimberling, Jan 14 2011.
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