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Search: id:A071603
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| A071603 |
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Number of different positive integers that we can obtain by using the integers {1,2,...,n} using each number at most once and the operators +, -, *, /. |
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+0
1
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OFFSET
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1,2
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LINKS
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Index entries for similar sequences
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EXAMPLE
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a(4)=31 because we can obtain the positive integers 1,2,...,28 and 30,32,36 by using the integers {1, 2, 3, 4} at most once and the four operations. For example 30 = 3*2*(4+1)
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CROSSREFS
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Cf. A060315, A070960.
Adjacent sequences: A071600 A071601 A071602 this_sequence A071604 A071605 A071606
Sequence in context: A087648 A086616 A040027 this_sequence A090595 A027040 A111063
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KEYWORD
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more,nonn
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AUTHOR
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Koksal Karakus (karakusk(AT)hotmail.com), Jun 02 2002
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