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Search: id:A054903
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| 104, 147, 596, 1415, 4850, 5337, 370047, 1630622, 35020303, 120221396, 3954451796
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OFFSET
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1,1
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COMMENT
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Below 1000000 only 7 such composite numbers were found beside more than 16000 primes..
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REFERENCES
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J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 104, p. 37, Ellipses, Paris 2008.
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FORMULA
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Composite numbers n so that Sigma[n]+6=Sigma[n+6].
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EXAMPLE
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n=104,Sigma[104]+6=210+6=216=Sigma[104+6]=Sigma[110]
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CROSSREFS
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A015913-A015917, A023200-A023203, A046133, A001359, A054799.
Sequence in context: A095641 A055036 A052476 this_sequence A074228 A044336 A044717
Adjacent sequences: A054900 A054901 A054902 this_sequence A054904 A054905 A054906
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), May 23 2000
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EXTENSIONS
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More terms from Jud McCranie (j.mccranie(AT)comcast.net), May 25 2000
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