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Squares whose decimal digits are nonsquares (2, 3, 5, 6, 7, 8).
4

%I #12 Aug 28 2016 03:49:12

%S 25,36,225,256,576,625,676,5625,5776,7225,8836,27225,27556,33856,

%T 37636,55225,65536,75625,225625,226576,235225,265225,266256,275625,

%U 276676,286225,352836,367236,378225,525625,538756,553536,585225,586756,665856

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

%H Harvey P. Dale and Charles R Greathouse IV, <a href="/A077437/b077437.txt">Table of n, a(n) for n = 1..10000</a> (first 294 terms from Dale)

%t Flatten[Table[Select[FromDigits/@Tuples[{2,3,5,6,7,8},n],IntegerQ[ Sqrt[ #]]&],{n,2,6}]] (* _Harvey P. Dale_, Feb 05 2014 *)

%o (PARI) is(n)=issquare(n) && #setintersect(Set(digits(n)),[0,1,4,9])==0 \\ _Charles R Greathouse IV_, Aug 28 2016

%Y Cf. A019544, A000290. Different from A077676.

%K nonn,base

%O 1,1

%A _Reinhard Zumkeller_, Nov 06 2002

%E Replaced 9 by 8 in the definition. - _Tanya Khovanova_, Dec 09 2008