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Search: id:A076068
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| A076068 |
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Smallest number that can be formed by using the nonzero digits of the numbers 1+n(n-1)/2 through n(n+1)/2. |
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+0
2
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| 1, 23, 456, 1789, 1111112345, 11111226789, 22222222345678, 122333333334569, 12333344444445789, 1234444455555556789, 123455555666666666789, 12345666677777777777889, 112345677888888888889999
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Is there any r and s such that a(r) = a(s)? Probably not.
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EXAMPLE
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a(4) = 1789 (=01789) formed by using digits of 7,8,9 and 10.
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CROSSREFS
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Cf. A080479, A080480.
Sequence in context: A016197 A009008 A158453 this_sequence A062273 A066547 A001369
Adjacent sequences: A076065 A076066 A076067 this_sequence A076069 A076070 A076071
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Oct 05 2002
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EXTENSIONS
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More terms from David Wasserman (dwasserm(AT)earthlink.net), Mar 19 2005
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