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Search: id:A055153
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| A055153 |
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Numbers n such that sigma(n) = 7n/2. |
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+0
2
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OFFSET
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1,1
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COMMENT
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The next term of this sequence is greater than 5*10^9. - Farideh Firoozbakht (f.firoozbakht(AT)sci.ui.ac.ir), Nov 29 2003
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EXAMPLE
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Sigma(4320)=15120=7*4320/2, so 4320 is in the sequence.
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MATHEMATICA
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Do[If[DivisorSigma[1, m]==3.5*m, Print[m]], {m, 2*10^8}]
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CROSSREFS
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Cf. A007539, A000396, A005820, A027687, A000203.
Sequence in context: A023346 A101619 A124596 this_sequence A008409 A028384 A107542
Adjacent sequences: A055150 A055151 A055152 this_sequence A055154 A055155 A055156
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KEYWORD
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nonn
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AUTHOR
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Jud McCranie (j.mccranie(AT)comcast.net), Jun 16 2000
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