Need help with mask and/or rule - 7 characters, must have a letter and number

[Pusher]

My initial suggestion would be to run something like

hashcat -a 3 -1 ?l?u?d ?1?1?1?1?1?1?1 --stdout > m3200candidates.txt

and then use grep to output all those that does not contain only numbers or only letters. I'm not strong with grep, though, so not sure exactly how to do it....

Maybe something like

hashcat -a 3 -1 ?l?u?d ?1?1?1?1?1?1?1 --stdout | grep -v [a-zA-Z]{7} | grep -v [0-9]{7} > m3200candidates.txt

I was able to replicate that using crunch.  The problem is that I believe it would be about 17TB of data.  So I was hoping to avoid a wordlist.