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A158304 Numbers n such that n^2 contains no digit bigger than 4. 4
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Erich Friedman, What's Special About This Number?

MAPLE

Contribution from R. J. Mathar, May 23 2010: (Start)

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) ; (End)

MATHEMATICA

Select[Range[0, 1100], Max[IntegerDigits[#^2]]<5&] (* Harvey P. Dale, Nov 06 2016 *)

CROSSREFS

Cf. A158082, A136810.

Sequence in context: A121717 A217072 A106518 * A007089 A159952 A136820

Adjacent sequences:  A158301 A158302 A158303 * A158305 A158306 A158307

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, May 23 2010

EXTENSIONS

Extended by several correspondents, May 24 2010

STATUS

approved

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Last modified March 29 15:31 EDT 2017. Contains 284273 sequences.