Search: id:A033286
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%I A033286
%S A033286 2,6,15,28,55,78,119,152,207,290,341,444,533,602,705,848,1003,1098,1273,
%T A033286 1420,1533,1738,1909,2136,2425,2626,2781,2996,3161,3390,3937,4192,4521,
%U A033286 4726,5215,5436,5809,6194,6513,6920,7339,7602,8213,8492,8865,9154,9917
%N A033286 n*(n-th prime).
%C A033286 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
%C A033286 Sums of rows of the triangle in A005145. [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), 
               Aug 05 2009]
%C A033286 a(n) = n * A000040(n) = n * A008578(n) = n * A158611(n+1). [From Jaroslav 
               Krizek (jaroslav.krizek(AT)atlas.cz), Aug 31 2009]
%H A033286 Albert Frank, <a href="http://www.paulcooijmans.com/oth/intcont2003.html">
               International Contest Of Logical Sequences</a>, 2002 - 2003. Item 
               1
%H A033286 Albert Frank, <a href="http://www.paulcooijmans.com/oth/intcont2003ans.html">
               Solutions of International Contest Of Logical Sequences</a>, 2002 
               - 2003.
%p A033286 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]
%t A033286 Table[Prime[n]*n, {n, 38}] (Alonso Delarte)
%o A033286 (Mupad) ithprime(i)*i $ i = 1..47 - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), 
               Feb 26 2007
%o A033286 (MAGMA) [ n*NthPrime(n): n in [1..47] ]; [From Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), 
               Sep 09 2009]
%Y A033286 Cf. A014689.
%Y A033286 Sequence in context: A091766 A138621 A163061 this_sequence A098651 A087427 
               A141126
%Y A033286 Adjacent sequences: A033283 A033284 A033285 this_sequence A033287 A033288 
               A033289
%K A033286 nonn
%O A033286 1,1
%A A033286 N. J. A. Sloane (njas(AT)research.att.com).

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