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Search: id:A055009
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| A055009 |
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a(n) = smallest composite number x such that Sigma[x+Q[n]]=Sigma[x]+Q[n], where Q[n]=A002110(n) primorial and Sigma is A000203. |
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+0
4
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| 434, 104, 44, 176, 2924, 34256, 83509, 539081, 254963216, 14600541172
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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for n=7, a(7)=83509=37*37*61, Sigma[83509]+510510=87234+510510=Sigma[83509+510510]= Sigma[594019]=597744
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CROSSREFS
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The prime solutions for particular Sigma[x+primorial]=Sigma[x]+primorial equations are in A049481-A049485.
A000203, A002110, A015913-A015917, A049902-A049905, A049481-A049485.
Sequence in context: A059665 A059664 A108832 this_sequence A054982 A108785 A050507
Adjacent sequences: A055006 A055007 A055008 this_sequence A055010 A055011 A055012
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KEYWORD
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more,nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), May 31 2000
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EXTENSIONS
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a(9)-a(10) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Oct 15 2008
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