id:A071314 - OEIS Search Results

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a(n) is the smallest number that cannot be obtained from the numbers {2^0,2^1,...,2^n} using each number at most once and the operators +, -, *, /.

+0
1

2, 4, 11, 27, 77, 595, 2471, 9643, 19351 (list; graph; listen)

	OFFSET	`0,1`
	LINKS	`G. Bannay, LE COMPTE EST BON` `Index entries for similar sequences`
	EXAMPLE	`a(2)=11 because using {1,2,4} and the four operations we can obtain all the numbers up to 10, for example 10=(4+1)*2, but we cannot obtain 11 in the same way.`
	CROSSREFS	`Cf. A060315.` `Adjacent sequences: A071311 A071312 A071313 this_sequence A071315 A071316 A071317` `Sequence in context: A123432 A090899 A123440 this_sequence A123441 A086441 A131482`
	KEYWORD	`hard,more,nonn`
	AUTHOR	`Koksal Karakus (karakusk(AT)hotmail.com), Jun 11 2002`

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Last modified October 10 20:39 EDT 2008. Contains 144831 sequences.