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Search: id:A071110
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| A071110 |
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a(n) is the smallest integer >=0 we cannot obtain from n, n+1, n+2, n+3, n+4 and the operators +, -, *, /, using each number only once. |
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+0
6
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| 29, 76, 141, 172, 193, 197, 205, 211, 245, 181, 162, 85, 86, 69, 71, 61, 62, 67, 52, 53, 58, 58, 58, 59, 62, 45, 46, 49, 20, 51, 7, 22, 7, 7, 10, 7, 7, 7, 7, 15, 7, 13, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 10, 7, 7, 7, 7, 7, 7, 10, 7, 7
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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It seems that a(n)=7 for all n>=62, but this needs to be proved.
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LINKS
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G. Bannay, LE COMPTE EST BON
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EXAMPLE
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a(61)=10 because by using 61, 62, 63, 64, 65 we can get 62-61=1, 63-61=2, ..., 63/((64-61)*(65-62))=7, (65-61)*(64+62)/63=8, (65-62)*(64-61)=9 but we cannot obtain 10 in the same way.
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CROSSREFS
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Cf. A060316.
Sequence in context: A063312 A161617 A142305 this_sequence A044167 A044548 A144584
Adjacent sequences: A071107 A071108 A071109 this_sequence A071111 A071112 A071113
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KEYWORD
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nonn
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AUTHOR
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Koksal Karakus (karakusk(AT)hotmail.com), May 27 2002
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