The composite cofactor of 10,387+ was the product of 80-digit and 143-digit prime numbers:

80-digit prime factor:
35037423610997086622096063353212253926195272207441939622830330161546317292588303

143-digit prime factor:
38889628638569601104885745910305810521309841050950415367273378889527486268283796029292760\
115427939721808793488543910010656122551369920766848757

The factors will be reported to the Cunningham project and will be recorded on Page 118.