A158304 - OEIS

A158304

Numbers k such that k^2 contains no digit greater than 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, 1021

(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

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

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