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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 September 26 02:39 EDT 2020. Contains 337346 sequences. (Running on oeis4.)