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A134844
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Numbers k such that k contains no zero but k^2 contains at least one zero.
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19
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32, 33, 45, 47, 48, 49, 51, 52, 53, 55, 64, 71, 78, 84, 95, 97, 98, 99, 138, 142, 143, 144, 145, 147, 148, 149, 151, 152, 153, 155, 174, 175, 176, 179, 195, 197, 198, 199, 217, 224, 225, 226, 241, 243, 245, 246, 247, 248, 249, 251, 252, 253, 255, 257, 259, 265
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OFFSET
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1,1
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COMMENTS
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Contains all numbers with no zero that start with 32. - Robert Israel, Jun 25 2019
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LINKS
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EXAMPLE
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a(1)=32 because 1024 = 32^2.
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MAPLE
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filter:= proc(n) local L;
L:= convert(n, base, 10);
if member(0, L) then return false fi;
L:= convert(n^2, base, 10);
member(0, L)
end proc:
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MATHEMATICA
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a = {}; Do[Do[Do[k = 100s + 10n + m; w = IntegerDigits[k^2]; If[MemberQ[w, 0], AppendTo[a, k]], {n, 1, 9}], {m, 1, 9}], {s, 0, 9}]; Union[a]
Select[Range[300], DigitCount[#, 10, 0]==0&&DigitCount[#^2, 10, 0]>0&] (* Harvey P. Dale, Mar 20 2012 *)
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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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