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Search: id:A132996
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| A132996 |
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a(n) = GCD(sum{k=1 to n} c(k), product{j=1 to n} c(j)), where c(k) is the kth composite. |
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+0
1
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| 4, 2, 6, 27, 1, 1, 63, 6, 2, 112, 12, 9, 175, 1, 224, 250, 1, 5, 5, 1, 400, 14, 7, 5, 3, 6, 2, 8, 12, 3, 17, 847, 896, 22, 1, 1, 1, 6, 2, 1, 3, 3, 1, 2, 6, 31, 1, 1, 26, 4, 28, 2, 1, 1, 10, 2368, 2448, 9, 7, 2695, 20, 2, 1, 1, 31, 18, 2, 1, 9, 3596, 52, 10, 1, 1, 1, 5, 4300, 2, 74, 4624
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OFFSET
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1,1
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EXAMPLE
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The first 8 composites are 4,6,8,9,10,12,14,15. 4+6+8+9+10+12+14+15 = 78 = 2*3*13. So a(8) = GCD(2*3*13, 4*6*8*9*10*12*14*15) = 6.
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CROSSREFS
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Cf. A053767, A036691.
Sequence in context: A019104 A019119 A019181 this_sequence A019182 A019105 A087056
Adjacent sequences: A132993 A132994 A132995 this_sequence A132997 A132998 A132999
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), Nov 22 2007
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 13 2008
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