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A028909
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Arrange digits of 2^n in ascending order.
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14
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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
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listen;
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internal format)
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OFFSET
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0,2
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COMMENTS
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Leading zeros are discarded (e.g., 2^23 = 8388608 -> 0368888 becomes 368888).
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LINKS
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MAPLE
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a:= n-> parse(cat(sort(convert(2^n, base, 10))[])):
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MATHEMATICA
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Table[FromDigits[Sort[IntegerDigits[2^n]]], {n, 0, 40}] (* Harvey P. Dale, Aug 20 2013 *)
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PROG
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(Magma) [Seqint(Reverse(Sort(Intseq(2^n)))):n in [0..35]]; // Vincenzo Librandi, Jan 22 2020
(Python)
return int(''.join(sorted(str(2**n)))) # Chai Wah Wu, Feb 19 2021
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CROSSREFS
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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).
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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