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 A091333 Number of 1's required to build n using +, -, *, and parentheses. 6
 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; text; internal format)
 OFFSET 1,2 LINKS Janis Iraids, Table of n, a(n) for n = 1..10000 Juris Cernenoks, Janis Iraids, Martins Opmanis, Rihards Opmanis, Karlis Podnieks, Integer Complexity: Experimental and Analytical Results II, arXiv:1409.0446, 2014 Janis Iraids, A C program to compute the sequence J. Iraids, K. Balodis, J. Cernenoks, M. Opmanis, R. Opmanis and K. Podnieks, Integer Complexity: Experimental and Analytical Results. arXiv preprint arXiv:1203.6462, 2012. - From N. J. A. Sloane, Sep 22 2012 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 * A293771 A005245 A061373 Adjacent sequences:  A091330 A091331 A091332 * A091334 A091335 A091336 KEYWORD nonn AUTHOR Jens Voß, Dec 30 2003 STATUS approved

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Last modified December 15 20:00 EST 2019. Contains 330000 sequences. (Running on oeis4.)