true or false matching list

[blott5fm]

	A	B	C
1	45456	45456
2		47845
3		45489
4		45456
5		44565

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In cell C1 I would like a formula that will r eturn "True" if the value in cell A1 matches a value in column B1:B56000 otherwise "False".

 

[svendiamond]

=if(countif(b:b,a1)>=1,"true","false")

 

[petertenthije]

=iferror(vlookup($A1;$B$1:$B$56000;1;False)=$A1;false)

 

[blott5fm]

Works like a charm. Had another suggestion however, your's is a tad more elegant. Thanks much.