Can you tell me the way to achieve that?

So if I have an old public key how can I tell how many bits that pkey is ? (to run it in pollard kan)

No I mean like , 63 and 65 were solved but 64 should be lower then 65 , So how come its not solved O_o

Guys Im pretty new to this ,
I just had to ask.


I see that 63 and 65 are solved but 64 is empty.
Does that mean some one have solved it and changed the key OR no one solved it ? Im just curios as to why its not solved while both 63 and 65 are solved