The composite cofactor of 7,311- was the product of 66-digit and 160-digit prime numbers:

66-digit prime factor:
300816696076140900609570360532034016686672572500196266141997289033

160-digit prime factor:
1756560862778457393639774753663646868150598408308118878219230555826805955171841738\
531624623756542243961880565002404773332396762823189273396255385704913755864589

The factors will be reported to the Cunningham project and will be recorded on Page 114.