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A071905
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a(n) is the smallest positive integer (which is a polynomial of degree 0) that cannot be obtained using the polynomials {x, x+1, ..., x+n} using each polynomial at most once and the operations +, -, *, /.
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0
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OFFSET
| 0,2
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LINKS
| Index entries for similar sequences
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EXAMPLE
| a(3)=5 because using {x, x+1, x+2, x+3} we can get x+1-x=1, x+2-x=2, x+3-x=3, (x+2-x)*(x+3-(x+1))=4 but we cannot obtain 5 in the same way.
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CROSSREFS
| Cf. A060315, A060316, A071110.
Sequence in context: A063792 A172508 A167134 * A067573 A103199 A054217
Adjacent sequences: A071902 A071903 A071904 * A071906 A071907 A071908
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KEYWORD
| hard,more,nice,nonn
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AUTHOR
| Koksal Karakus (karakusk(AT)hotmail.com), Jun 13 2002
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