This number called the office today. Upon seeing the caller id, I chose not to answer it because it might be a number for the Google/Google Plus robo calls.
Also interesting: There is a Google robocall number that purportedly originates from my state. The previous three times it's called and I've let it ring to the answering machine, a different Google robocall number calls later in the day from a different area code. I'm not sure if this is persistence or mere coincidence.