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A062893
Number of squares that can be obtained by using some or all of the digits of n.
0
1, 1, 0, 0, 1, 0, 0, 0, 0, 1, 2, 1, 1, 1, 2, 1, 2, 1, 2, 2, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 2, 2, 1, 1, 1, 1, 2, 1, 1, 3, 1, 1, 1, 0, 1, 0, 0, 0, 0, 1, 1, 2, 0, 1, 2, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 2, 0, 0, 1, 0, 0, 0, 0, 1, 2, 2, 1, 1, 3, 1, 1, 1, 1, 1, 3, 2, 2, 2, 3
OFFSET
0,11
EXAMPLE
a(169) = 6 the squares obtained by using the digits are 1,9,16, 169, 196, 961.
MATHEMATICA
Table[Length[Select[Union[Drop[FromDigits/@Flatten[Permutations/@ Subsets[IntegerDigits[n]], 1], 1]], IntegerQ[Sqrt[#]] &]], {n, 0, 104}] (* Jayanta Basu, May 17 2013 *)
CROSSREFS
Sequence in context: A307610 A125029 A339839 * A328512 A302041 A302031
KEYWORD
base,nonn,easy
AUTHOR
Amarnath Murthy, Jun 29 2001
EXTENSIONS
Corrected and extended by Larry Reeves (larryr(AT)acm.org) and Dean Hickerson, Jul 02 2001
STATUS
approved