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A071228
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a(n) = n*(n-th composite number).
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1
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4, 12, 24, 36, 50, 72, 98, 120, 144, 180, 220, 252, 286, 336, 375, 416, 459, 504, 570, 640, 693, 748, 805, 864, 950, 1014, 1080, 1176, 1276, 1350, 1426, 1536, 1617, 1700, 1785, 1872, 1998, 2090, 2184, 2280, 2378, 2520, 2666, 2772, 2880, 2990, 3102
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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Complement of A171521(n). [From Jaroslav Krizek, Dec 13 2009]
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LINKS
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Table of n, a(n) for n=1..47.
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FORMULA
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a(1)= 1*4, a(2)= 2*6, a(3)= 3*9, a(4) = 4*10
a(n) = A000027(n) * A002808(n) = n * A002808(n). [From Jaroslav Krizek, Dec 13 2009]
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MAPLE
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count := 1: for i from 2 to 100 do if isprime(i) then else printf(`%d, `, i*count); count := count+1 fi: od:
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CROSSREFS
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Sequence in context: A008077 A072389 A218391 * A108997 A159795 A033602
Adjacent sequences: A071225 A071226 A071227 * A071229 A071230 A071231
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), May 17 2002
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EXTENSIONS
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More terms and Maple code from James A. Sellers, May 28, 2002
Edited by N. J. A. Sloane, Jul 02 2008 at the suggestion of R. J. Mathar
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STATUS
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approved
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