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A046030
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Numbers whose digits are squares.
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9
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0, 1, 4, 9, 10, 11, 14, 19, 40, 41, 44, 49, 90, 91, 94, 99, 100, 101, 104, 109, 110, 111, 114, 119, 140, 141, 144, 149, 190, 191, 194, 199, 400, 401, 404, 409, 410, 411, 414, 419, 440, 441, 444, 449, 490, 491, 494, 499, 900, 901, 904, 909, 910, 911, 914, 919
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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LINKS
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FORMULA
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Sum_{n>=2} 1/a(n) = 2.105050135115910443669713125834050962799269137280589957713644901011872709688... (calculated using Baillie and Schmelzer's kempnerSums.nb, see Links). - Amiram Eldar, Feb 15 2024
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MATHEMATICA
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Union[FromDigits/@Flatten[With[{l={0, 1, 4, 9}}, Table[Tuples[l, {i}], {i, 3}]], 1]] (* Harvey P. Dale, Dec 19 2010 *)
Select[Range[0, 999], Intersection[{2, 3, 5, 6, 7, 8}, Union[IntegerDigits[#]]] == {} &] (* T. D. Noe, Dec 20 2010 *)
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PROG
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(Magma) [n: n in [0..1000] | forall{d: d in Intseq(n) | d in [0, 1, 4, 9]}]; // Bruno Berselli, Jan 10 2013
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CROSSREFS
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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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