A007936 Some permutation of digits is a square.

1, 4, 9, 10, 16, 18, 25, 36, 40, 46, 49, 52, 61, 63, 64, 81, 90, 94, 100, 106, 108, 112, 121, 136, 144, 148, 160, 163, 169, 180, 184, 196, 205, 211, 225, 234, 243, 250, 252, 256, 259, 265, 279, 289, 295, 297, 298, 306, 316, 324, 342, 360, 361, 400, 406, 409, 414

Offset: 1

Author

R. Muller

Keywords

• nonn
• base
• easy

References

• M. Le, On Smarandache Pseudo-Powers of Third Kind, Smarandache Notions Journal, Vol. 10, No. 1-2-3, 1999, 150-151.

Links

• N. J. A. Sloane, Table of n, a(n) for n = 1..6948
• F. Smarandache, Only Problems, Not Solutions!

Crossrefs

Cf. A235993 (leading zeros not allowed).

Programs

Mathematica

Select[Range[500],Length[Select[FromDigits/@Permutations[ IntegerDigits[#]], IntegerQ[Sqrt[#]]&]]>0&]  (* Harvey P. Dale, Mar 30 2011 *)