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A033286
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n*(n-th prime).
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15
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2, 6, 15, 28, 55, 78, 119, 152, 207, 290, 341, 444, 533, 602, 705, 848, 1003, 1098, 1273, 1420, 1533, 1738, 1909, 2136, 2425, 2626, 2781, 2996, 3161, 3390, 3937, 4192, 4521, 4726, 5215, 5436, 5809, 6194, 6513, 6920, 7339, 7602, 8213, 8492, 8865, 9154, 9917
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Does an n exist such that n*p(n)/(n+p(n)) is an integer ? - Ctibor O. Zizka (ctibor.zizka(AT)seznam.cz), Mar 04 2008
Sums of rows of the triangle in A005145. [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 05 2009]
Complement of A171520(n). [From Jaroslav Krizek (jaroslav.krizek(AT)atlas.cz), Dec 13 2009]
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LINKS
| Albert Frank, International Contest Of Logical Sequences, 2002 - 2003. Item 1
Albert Frank, Solutions of International Contest Of Logical Sequences, 2002 - 2003.
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FORMULA
| a(n) = n * A000040(n) = n * A008578(n+1) = n * A158611(n+2). [From Jaroslav Krizek (jaroslav.krizek(AT)atlas.cz), Aug 31 2009]
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MAPLE
| A033286 := proc(n) n*ithprime(n) ; end proc:
seq(A033286(n), n=1..20) ; # R. J. Mathar, Mar 21 2011
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MATHEMATICA
| Table[Prime[n]*n, {n, 38}] (Alonso Delarte)
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PROG
| (Mupad) ithprime(i)*i $ i = 1..47 - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Feb 26 2007
(MAGMA) [ n*NthPrime(n): n in [1..47] ]; [From Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Sep 09 2009]
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CROSSREFS
| Cf. A014689.
Sequence in context: A192691 A138621 A163061 * A182724 A098651 A087427
Adjacent sequences: A033283 A033284 A033285 * A033287 A033288 A033289
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Correction for change of offset in A158611 and A008578 in Aug 2009 Jaroslav Krizek (jaroslav.krizek(AT)atlas.cz), Jan 27 2010
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