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A194766 Numbers which can be written using their digits in order and only multiplication and squaring operators. 0
128, 175, 384, 672, 735, 1296, 6144, 18432, 23328, 34992, 82944, 442368, 1492992, 2333772, 2612736, 3981312, 4128768, 9289728, 12192768, 13226976, 13395375, 13436928, 21233664, 22127616, 27869184, 49787136, 161243136 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..27.

Erich Friedman, Problem of the month August 2003

EXAMPLE

128 = 1*2^2*8. 175=1*7*5^2. 384=3*8*4^2. 672=6*7*(2^2)^2.

735 = 7^2*3*5. 1296 = 1*2^2*9*6^2. 6144=6*4*(4^2)^2.

21233664 = ((2^2)^2)^2*1*(2^2)^2*3*3*6*6*4^2.

CROSSREFS

Sequence in context: A130445 A114565 A243812 * A257211 A109651 A114408

Adjacent sequences:  A194763 A194764 A194765 * A194767 A194768 A194769

KEYWORD

nonn,base

AUTHOR

Kausthub Gudipati, Sep 02 2011

EXTENSIONS

Example corrected by Harvey P. Dale, Aug 20 2012

STATUS

approved

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Last modified September 20 14:26 EDT 2020. Contains 337265 sequences. (Running on oeis4.)