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 A080240 Define two sequences by A_n = mex{A_i,B_i : 0 <= i < n} for n >= 0, B_0=0, B_1=1 and for n >= 2, B_n = 2B_{n-1}+(-1)^{A_n}. Sequence gives A_n. 1
 0, 1, 2, 4, 5, 6, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS The minimal excluded value of set of nonnegative numbers S is mex S = least nonnegative integer not in S. The sequence B_n is given in A080241. LINKS A. S. Fraenkel, Home Page A. S. Fraenkel, New games related to old and new sequences, INTEGERS, Electronic J. of Combinatorial Number Theory, Vol. 4, Paper G6, 2004. CROSSREFS Cf. A080241. Sequence in context: A172284 A039242 A039185 * A135668 A276216 A226946 Adjacent sequences:  A080237 A080238 A080239 * A080241 A080242 A080243 KEYWORD nonn AUTHOR Aviezri S. Fraenkel, Mar 12 2003 EXTENSIONS More terms from Emeric Deutsch, Apr 13 2005 STATUS approved

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Last modified April 11 06:00 EDT 2021. Contains 342886 sequences. (Running on oeis4.)