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Search: id:A048257
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| A048257 |
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Integers whose sum of divisors is a 7th power. |
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+0
3
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| 1, 93, 127, 11811, 112890, 120054, 124338, 127330, 132770, 133998, 134090, 137058, 138754, 139962, 146710, 148665, 148810, 149534, 153986, 155510, 160215, 161194, 164985, 167134, 170986, 173098, 183687, 184682, 187143, 191913, 198485
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OFFSET
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1,2
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FORMULA
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Sigma [ 1, a[ n ] ] = x^7, where the initial values of x are 1, 2, 4, 6 (48 times), ...
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EXAMPLE
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Divisors[ 11811 ]={1,3,31,93,127,381,3937,11811} and sigma(11811)=16384=4^7.
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CROSSREFS
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A006532, A020477, A019422, A019423, A018427, A048251- A048256.
Adjacent sequences: A048254 A048255 A048256 this_sequence A048258 A048259 A048260
Sequence in context: A039550 A099019 A082131 this_sequence A044425 A044806 A043363
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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)
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