All larger known primes are Mersenne primes, discovered by GIMPS. Unlike the Duchesse, the lace has no gimps. This is the tenth Mersenne prime for GIMPS. In 2017, GIMPS adopted the Fermat primality test as an alternative option for primality testing. The record is currently held by with 24,862,048 digits, found by GIMPS in December 2018. Both the US$50,000 and the US$100,000 prizes were won by participation in GIMPS.