Actinidia five small petals. Most of the species are dioecious with separate male and female plants, but some are monoecious. The fruit is a large berry containing numerous small seeds; in most species, the fruit is edible. In particular, this genus is known for the species "Actinidia deliciosa", the kiwifruit or Chinese gooseberry, and for the hardy ornamental "A. kolomikta". "Actinidia" macrofossils have been recovered from the late Zanclean stage of Pliocene sites in Pocapaglia, Italy. The 40–60 species of "Actinidia" include: Kiwifruit is a cultivar group of "A. deliciosa", and hardy kiwi is the species "Actinidia arguta", which has small
Largest known prime number the progression of the largest known prime number in ascending order. Here M = 2 − 1 is the Mersenne number with exponent "n". The longest record-holder known was M = 524,287, which was the largest known prime for 144 years. No records are known before 1456. GIMPS found the fourteen latest records (all of them Mersenne primes) on ordinary computers operated by participants around the world. A list of the 5,000 largest known primes is maintained by Chris K. Caldwell, of which the twenty largest are listed below. Largest known prime number The largest known prime number () is