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Search: id:A033286
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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; listen)
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OFFSET
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1,1
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COMMENT
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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]
a(n) = n * A000040(n) = n * A008578(n) = n * A158611(n+1). [From Jaroslav Krizek (jaroslav.krizek(AT)atlas.cz), Aug 31 2009]
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LINKS
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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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MAPLE
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with (numtheory):a:=n->sum(ithprime(n), j=1..n):seq(a(n), n=1..47); [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Aug 24 2008]
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MATHEMATICA
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Table[Prime[n]*n, {n, 38}] (Alonso Delarte)
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PROGRAM
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(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
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Cf. A014689.
Sequence in context: A091766 A138621 A163061 this_sequence A098651 A087427 A141126
Adjacent sequences: A033283 A033284 A033285 this_sequence A033287 A033288 A033289
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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