A109072 Number of decimal digits ( counted with multiplicity ) in n but not in n^2.

0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 2, 1, 2, 0, 1, 0, 1, 2, 1, 1, 1, 2, 2, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 1, 1, 2, 1, 1, 0, 1, 1, 2, 2, 0, 1, 2, 2, 2, 0, 1, 2, 0, 0, 1, 0, 2, 1, 1, 1, 1, 2, 1, 0, 1, 0, 2, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 2, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1

Offset: 0

Author

Zak Seidov, Jun 20 2005

Keywords

• base
• easy
• nonn

Links

• Robert Israel, Table of n, a(n) for n = 0..10000

Crossrefs

Cf. A076493 (number of common and distinct decimal digits of n and n^2).

Cf. A109071 (number of common decimal digits (counted with multiplicity) of n and n^2).

Programs

Maple

f:= proc(n) local L2;
L2:= convert(n^2,base,10);
nops(remove(t -> member(t,L2), convert(n,base,10)));
end proc:
map(f, [$0..200]); # Robert Israel, Feb 22 2017

Mathematica

UnsortedComplement[x_List, y__List]:=Replace[x, Dispatch[(#\[RuleDelayed]Sequence[])&/@Union[y]], 1]; Table[Length[UnsortedComplement[IntegerDigits[n], IntegerDigits[n^2]]], {n, 0, 200}]