A091333 - OEIS

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A091333

Number of 1's required to build n using +, -, * and parentheses.

1, 2, 3, 4, 5, 5, 6, 6, 6, 7, 8, 7, 8, 8, 8, 8, 9, 8, 9, 9, 9, 10, 10, 9, 10, 10, 9, 10, 11, 10, 11, 10, 11, 11, 11, 10, 11, 11, 11, 11, 12, 11, 12, 12, 11, 12, 12, 11, 12, 12, 12, 12, 12, 11, 12, 12, 12, 13, 13, 12, 13, 13, 12, 12, 13, 13, 14, 13, 13, 13, 13, 12, 13, 13, 13, 13, 14 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	EXAMPLE	`A091333(23) = 10 because 23 = (1+1+1+1) * (1+1+1) * (1+1) - 1. (Note that 23 is also the smallest index at which A091333 differs from A005245.)`
	CROSSREFS	`Cf. A005245, A025280, A091334.` `Sequence in context: A200311 A007600 A195872 * A005245 A061373 A104135` `Adjacent sequences: A091330 A091331 A091332 * A091334 A091335 A091336`
	KEYWORD	`nonn`
	AUTHOR	`Jens Voss (jens(AT)voss-ahrensburg.de), Dec 30 2003`

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Last modified February 15 03:59 EST 2012. Contains 205694 sequences.