A071314 - OEIS

This site is supported by donations to The OEIS Foundation.

A071314

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 +, -, *, /.

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

	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.` `Sequence in context: A159339 A159337 A123440 * A123441 A086441 A148130` `Adjacent sequences: A071311 A071312 A071313 * A071315 A071316 A071317`
	KEYWORD	`hard,more,nonn`
	AUTHOR	`Koksal Karakus (karakusk(AT)hotmail.com), Jun 11 2002`

Content is available under The OEIS End-User License Agreement .

Last modified February 17 04:52 EST 2012. Contains 205985 sequences.