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Search: id:A111398
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| A111398 |
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Numbers which are the cube roots of the product of their proper divisors. |
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+0
4
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| 1, 24, 30, 40, 42, 54, 56, 66, 70, 78, 88, 102, 104, 105, 110, 114, 128, 130, 135, 136, 138, 152, 154, 165, 170, 174, 182, 184, 186, 189, 190, 195, 222, 230, 231, 232, 238, 246, 248, 250, 255, 258, 266, 273, 282, 285
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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This sequence is actually the sequence of 4-multiplicatively perfect numbers all of whose elements (>1) have prime signature {7}, {1,3} or {1,1,1}.
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FORMULA
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1 together with numbers with 8 divisors. - Vladeta Jovovic (vladeta(AT)Eunet.yu), Nov 12 2005
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CROSSREFS
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Cf. A048945, A111399. Essentially the same as A030626.
Cf. A030626, A007956.
Sequence in context: A109797 A129656 A048945 this_sequence A030626 A125639 A076496
Adjacent sequences: A111395 A111396 A111397 this_sequence A111399 A111400 A111401
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KEYWORD
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nonn
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AUTHOR
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Ant King, (mathstutoring(AT)ntlworld.com), Nov 11 2005
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