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A028909 Arrange digits of 2^n in ascending order. 14
1, 2, 4, 8, 16, 23, 46, 128, 256, 125, 124, 248, 469, 1289, 13468, 23678, 35566, 11237, 122446, 224588, 145678, 122579, 134449, 368888, 11266777, 23334455, 1466788, 112234778, 234455668, 12356789, 112344778, 1234446788, 2244667999 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Leading zeros are discarded (e.g., 2^23 = 8388608 -> 0368888 becomes 368888).

LINKS

Table of n, a(n) for n=0..32.

MATHEMATICA

Table[FromDigits[Sort[IntegerDigits[2^n]]], {n, 0, 40}] (* Harvey P. Dale, Aug 20 2013 *)

CROSSREFS

The following are parallel families: A000079 (2^n), A004094 (2^n reversed), A028909 (2^n sorted up), A028910 (2^n sorted down), A036447 (double and reverse), A057615 (double and sort up), A263451 (double and sort down); A000244 (3^n), A004167 (3^n reversed), A321540 (3^n sorted up), A321539 (3^n sorted down), A163632 (triple and reverse), A321542 (triple and sort up), A321541 (triple and sort down).

Sequence in context: A108566 A057615 A018416 * A108567 A261890 A072874

Adjacent sequences:  A028906 A028907 A028908 * A028910 A028911 A028912

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from Patrick De Geest, April 1998

STATUS

approved

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Last modified February 21 03:06 EST 2019. Contains 320364 sequences. (Running on oeis4.)