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 A207778 Smallest multiple of 2^n using only 1's and 2's. 1
 1, 2, 12, 112, 112, 2112, 2112, 122112, 122112, 12122112, 12122112, 12122112, 111212122112, 1111212122112, 11111212122112, 11111212122112, 11111212122112, 11111212122112, 111211111212122112, 111211111212122112, 111211111212122112, 111211111212122112 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS An induction-based argument can be used to show that this sequence is actually infinite. a(n) <= A053312(n). REFERENCES J. B. Tabov and P. J. Taylor, Methods of Problem Solving, Book 1, Australian Mathematics Trust, 1996. LINKS Alois P. Heinz, Table of n, a(n) for n = 0..300 CROSSREFS Cf. A000079, A007931, A023396, A053312, A126933. Sequence in context: A296644 A235860 A317208 * A102659 A212659 A191895 Adjacent sequences:  A207775 A207776 A207777 * A207779 A207780 A207781 KEYWORD nonn,base AUTHOR Lekraj Beedassy, Feb 20 2012 EXTENSIONS More terms from Alois P. Heinz, Feb 20 2012 STATUS approved

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Last modified January 22 02:46 EST 2022. Contains 350481 sequences. (Running on oeis4.)