id:A071997 - OEIS Search Results

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a(n) is the smallest positive integer that cannot be obtained by using the number 2 at most n times and the operators +, -, *, /.

+0
1

1, 3, 5, 7, 11, 19, 27, 43, 75, 115, 171, 307, 555, 691, 1383, 2467, 3627 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`G. Bannay, LE COMPTE EST BON`
	EXAMPLE	`a(3)=5 because using 2 at most thrice we can get 2/2=1, 2=2, 2+(2/2)=3, 2+2=4, but we cannot obtain 5 in the same way.`
	CROSSREFS	`Sequence in context: A144427 A082603 A161420 this_sequence A093442 A155008 A137814` `Adjacent sequences: A071994 A071995 A071996 this_sequence A071998 A071999 A072000`
	KEYWORD	`hard,more,nonn`
	AUTHOR	`Koksal Karakus (karakusk(AT)hotmail.com), Jun 17 2002`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.