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Search: id:A090493
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| A090493 |
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Least k such that n^k contains all the digits from 0 through 9, or -1 if no such k exists. |
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+0
1
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| 68, 39, 34, 19, 20, 18, 28, 24, -1, 23, 22, 22, 21, 12, 17, 14, 21, 17, 51, 17, 18, 14, 19, 11, 18, 13, 11, 12, 39, 11, 14, 16, 14, 19, 10, 13, 14, 17, 34, 11, 17, 13, 16, 15, 11, 12, 12, 9, 18, 16, 11, 13, 10, 12, 7, 13, 11, 11, 20, 14, 18, 13, 14, 10, 13, 10, 9, 11, 18, 15
(list; graph; listen)
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OFFSET
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2,1
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FORMULA
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a(10^e) = -1; a(m^e)=a(m)/e for e dividing a(m). - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 06 2004
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EXAMPLE
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a(5)=19: 5^19= 19073486328125.
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CROSSREFS
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Sequence in context: A144940 A087536 A033388 this_sequence A143737 A043595 A043828
Adjacent sequences: A090490 A090491 A090492 this_sequence A090494 A090495 A090496
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KEYWORD
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base,sign
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Dec 03 2003
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EXTENSIONS
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More terms from Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 06 2004
Corrected a(15), a(17), a(38), a(48), a(56) and a(65). (For each of these terms, the only 1 in n^k is the first digit.). - Jon E. Schoenfield (jonscho(AT)hiwaay.net), Sep 20 2008
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