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Search: id:A069512
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| A069512 |
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Geometric mean of digits = 2 and digits are in nondecreasing order. |
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+0
4
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| 2, 14, 22, 118, 124, 222, 1128, 1144, 1224, 2222, 11148, 11228, 11244, 12224, 22222, 111188, 111248, 111444, 112228, 112244, 122224, 222222, 1111288, 1111448, 1112248, 1112444, 1122228, 1122244, 1222224, 2222222, 12222224, 11112288
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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No number is obtainable by permuting the digits of other members - only one with ascending order of digits is included. Product of the digits = 2^k where k is the number of digits.
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EXAMPLE
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1128 is a term but 2118 is not.
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MATHEMATICA
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a = {}; b = 2; Do[c = Apply[ Times, IntegerDigits[n]]/b^Floor[ Log[10, n] + 1]; If[c == 1 && Position[a, FromDigits[ Sort[ IntegerDigits[n]]]] == {}, Print[n]; a = Append[a, n]], {n, 1, 10^7}]
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CROSSREFS
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Cf. A061426, A069516, A069518.
Sequence in context: A066613 A074312 A061426 this_sequence A036433 A109255 A051222
Adjacent sequences: A069509 A069510 A069511 this_sequence A069513 A069514 A069515
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KEYWORD
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nonn,base
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 30 2002
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EXTENSIONS
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Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 01 2002
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