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A110380
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a(n) = min{p+q+r +...} where p,q,r are distinct unary numbers ( containing only ones (of the form 10^k-1)/9) formed by using n ones.
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1
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1, 11, 12, 112, 122, 123, 1123, 1223, 1233, 1234, 11234, 12234, 12334, 12344, 12345, 112345, 122345, 123345, 123445, 123455, 123456, 1123456, 1223456, 1233456, 1234456, 1234556, 1234566, 1234567, 11234567, 12234567, 12334567, 12344567
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| Using n ones and only the + sign we get the following sums.
1 a(1) = 1
11 a(2) =11
1+11 a(3) = 12
1 +111 a(4) =112
11+111 a(5) = 122
1+11+111 a(6) =123
1+11+1111 a(7) =1123
1+111+1111
11+111+1111
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CROSSREFS
| Sequence in context: A096299 A110382 A095764 * A164854 A033047 A094624
Adjacent sequences: A110377 A110378 A110379 * A110381 A110382 A110383
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KEYWORD
| base,easy,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 25 2005
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EXTENSIONS
| More terms from Joshua Zucker (joshua.zucker(AT)stanfordalumni.org), May 08 2006
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