. regular polygon can be constructed by compass and straightedge if and only if the number of sides is the product of distinct Fermat primes and a power of 2
. The actor Ichikawa Ebizo as Usui Arataro Sadamitsu in the Shibaraku scene of the play "Seiwa Nidai Oyose Genji," performed at the Miyako Theater in the eleventh month, 1796