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A061503
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Sum_{k<=n} (tau(k^2)), where tau = sum of divisors function A000005.
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3
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1, 4, 7, 12, 15, 24, 27, 34, 39, 48, 51, 66, 69, 78, 87, 96, 99, 114, 117, 132, 141, 150, 153, 174, 179, 188, 195, 210, 213, 240, 243, 254, 263, 272, 281, 306, 309, 318, 327, 348, 351, 378, 381, 396, 411, 420, 423, 450, 455, 470, 479, 494, 497
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| Mentioned by S. R. Finch (Steven.Finch(AT)inria.fr) in a posting to the Number Theory List (NMBRTHRY(AT)LISTSERV.NODAK.EDU), Jun 13 2001.
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LINKS
| Harry J. Smith, Table of n, a(n) for n=1,...,1024
Kevin A. Broughan, Restricted divisor sums, Acta Arithmetica, vol. 101, (2002), pp. 105-114.
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FORMULA
| a(n) = Sum_{1<=j<=n^2} (floor(n/A019554(j))), - Antonio G. Astudillo (afg_astudillo(AT)hotmail.com), Jul 20 2002
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PROG
| (PARI) { for (n=1, 1024, write("b061503.txt", n, " ", sum(k=1, n, numdiv(k^2))) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 23 2009]
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CROSSREFS
| Cf. A000005, A061502. Partial sums of A048691.
Sequence in context: A047535 A182989 A190442 * A134659 A075624 A008333
Adjacent sequences: A061500 A061501 A061502 * A061504 A061505 A061506
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jun 14 2001
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