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

0,18

Links

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

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}]

Crossrefs

Cf. A076493, A109073.

Sequence in context: A378399 A202084 A337763 * A100727 A366134 A064892

Adjacent sequences: A109069 A109070 A109071 * A109073 A109074 A109075

Keyword

base,easy,nonn

Author

Zak Seidov, Jun 20 2005

Status

approved