A071313 - OEIS

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A071313

a(n) is the smallest number that cannot be obtained from the numbers {1,3,...,2*n-1} using each number at most once and the operators +, -, *, /.

2, 5, 11, 41, 92, 733, 4337, 28972, 195098 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	LINKS	`G. Bannay, LE COMPTE EST BON` `Index entries for similar sequences`
	EXAMPLE	`a(2)=5 because using {1,3} and the four operations we can obtain 1=1, 3-1=2, 3=3, 3+1=4 but we cannot obtain 5 in the same way.`
	CROSSREFS	`Cf. A060315.` `Sequence in context: A191029 A106886 A007700 * A172297 A128231 A088148` `Adjacent sequences: A071310 A071311 A071312 * A071314 A071315 A071316`
	KEYWORD	`hard,more,nonn`
	AUTHOR	`Koksal Karakus (karakusk(AT)hotmail.com), Jun 11 2002`

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Last modified February 16 09:00 EST 2012. Contains 205904 sequences.