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A158304
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Numbers n such that n^2 contains no digit bigger than 4.
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4
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0, 1, 2, 10, 11, 12, 18, 20, 21, 32, 38, 48, 49, 100, 101, 102, 110, 111, 120, 149, 152, 179, 180, 182, 200, 201, 210, 318, 320, 321, 332, 338, 348, 351, 361, 362, 380, 451, 452, 462, 480, 482, 490, 548, 549, 649, 1000, 1001, 1002, 1010, 1011, 1012, 1020, 1021
(list;
graph;
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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Harvey P. Dale, Table of n, a(n) for n = 1..1000
Erich Friedman, What's Special About This Number?
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MAPLE
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A158304 := proc(n) option remember; if n= 1 then 0; else for a from procname(n-1)+1 do d := convert(convert(a^2, base, 10), set) ; if max(op(d)) <= 4 then return a; end if; end do; end if; end proc:
seq(A158304(n), n=1..100) ; # R. J. Mathar, May 23 2010
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MATHEMATICA
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Select[Range[0, 1100], Max[IntegerDigits[#^2]]<5&] (* Harvey P. Dale, Nov 06 2016 *)
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CROSSREFS
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Cf. A158082, A136810.
Sequence in context: A121717 A217072 A106518 * A007089 A159952 A136820
Adjacent sequences: A158301 A158302 A158303 * A158305 A158306 A158307
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KEYWORD
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nonn,base
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AUTHOR
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N. J. A. Sloane, May 23 2010
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EXTENSIONS
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Extended by several correspondents, May 24 2010
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STATUS
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approved
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