A160109 Numbers k with the property that k^2 uses only nonsquare decimal digits (2,3,5,6,7,8).

5, 6, 15, 16, 24, 25, 26, 75, 76, 85, 94, 165, 166, 184, 194, 235, 256, 275, 475, 476, 485, 515, 516, 525, 526, 535, 594, 606, 615, 725, 734, 744, 765, 766, 816, 826, 856, 874, 875, 876, 885, 915, 924, 925, 934, 1524, 1525, 1526, 1535, 1624, 1635, 1665, 1666

Offset

1,1

Links

Table of n, a(n) for n=1..53.

Formula

a(n) = sqrt(A077437(n)).

Mathematica

nsdQ[n_]:=Module[{idn=IntegerDigits[n]}, !MemberQ[idn, 1] && And@@SquareFreeQ/@idn]; Select[Range[2000], nsdQ[#^2]&]  (* Harvey P. Dale, Feb 01 2011 *)

Crossrefs

Cf. A077437 (Squares whose decimal digits are nonsquares (2, 3, 5, 6, 7, 8)).

Sequence in context: A282466 A060724 A064949 * A351172 A191213 A121847

Adjacent sequences: A160106 A160107 A160108 * A160110 A160111 A160112

Keyword

base,nonn

Author

Zak Seidov, May 02 2009

Status

approved