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Search: id:A075761
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| A075761 |
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Numbers n such that there are at least 3 integers k from the set {2,3,4,5,6,7,8,9} such that the digital sum of each base k representation of n equals k. |
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+0
1
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| 13, 17, 19, 21, 25, 29, 31, 33, 37, 41, 57, 61, 65, 73, 85, 91, 121, 129, 133, 145, 169, 225, 253, 257, 261, 265, 281, 301, 325, 337, 361, 385, 505, 513, 757, 785, 841, 1057, 1081, 1093, 1381, 1625, 2080, 2241, 3241, 4117, 4377, 4401, 5125, 8281, 16416
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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13, 33, 37 and 57 work for 4 bases. 85 is the only integer found that works for 5 bases: 3, 4, 5, 7 and 8.
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EXAMPLE
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91 in base 3 = 10101 and 1 + 0 + 1 + 0 + 1 = 3, which is the base. 91 in base 6 = 231 and 2 + 3 + 1 = 6, which is the base. 91 in base 7 = 160 and 1 + 6 + 0 = 7, which is the base.
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CROSSREFS
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Sequence in context: A066918 A117326 A052055 this_sequence A046064 A008365 A132077
Adjacent sequences: A075758 A075759 A075760 this_sequence A075762 A075763 A075764
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KEYWORD
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base,nonn
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AUTHOR
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Paul Lusch (plusch(AT)flash.net), Oct 08 2002
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