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Search: id:A132080
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| A132080 |
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Numbers having in decimal representation no common digits with all their proper divisors. |
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+0
2
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| 2, 3, 4, 5, 6, 7, 8, 9, 23, 27, 29, 34, 37, 38, 43, 46, 47, 49, 53, 54, 56, 57, 58, 59, 67, 68, 69, 73, 76, 78, 79, 83, 86, 87, 89, 97, 223, 227, 229, 233, 239, 247, 249, 257, 259, 263, 267, 269, 277, 283, 289, 293, 307, 323, 329, 334, 337, 347, 349, 353, 356, 358, 359
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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A038603 is a subsequence.
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LINKS
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R. Zumkeller, Table of n, a(n) for n = 1..10000
Eric Weisstein's World of Mathematics, Proper Divisor
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EXAMPLE
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Proper divisors of a(20)=54: {1, 2, 3, 6, 9, 18, 27}
with set of digits {1,2,3,6,7,8,9} containing neither 4 nor 5.
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CROSSREFS
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Sequence in context: A064702 A034710 A061672 this_sequence A048386 A133134 A133505
Adjacent sequences: A132077 A132078 A132079 this_sequence A132081 A132082 A132083
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KEYWORD
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nonn,base
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 09 2007
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