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Search: id:A121683
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| 216, 1728, 5832, 8000, 13824, 21952, 27000, 74088, 110592, 157464, 175616, 195112, 216000, 238328, 287496, 314432, 343000, 373248, 729000, 884736, 941192, 1061208, 1124864, 1259712, 1481544, 1520875, 1643032, 1771561, 1860867, 1953125
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OFFSET
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1,1
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COMMENT
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Untouchable numbers (cf. A005114) that are third powers (cf. A000578); a(1) to a(7) are the third powers of 6, 12, 18, 20, 24, 28, 30.
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EXAMPLE
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216 = 6^3 = A000578(6) = A005114(13).
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CROSSREFS
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Cf. A005114, A000578, A111278 (untouchable squares).
Sequence in context: A124581 A016863 A033698 this_sequence A016911 A017055 A017139
Adjacent sequences: A121680 A121681 A121682 this_sequence A121684 A121685 A121686
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KEYWORD
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nonn
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AUTHOR
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Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Aug 15 2006
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EXTENSIONS
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a(8)-a(30) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Jul 19 2008
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