What is the product of the two smallest prime factors of 2^{100} - 1?
2^100 - 1==1 267650 600228 229401 496703 205375 (31 digits) = 3 × 5^3 × 11 × 31 × 41 × 101 × 251 × 601 × 1801 × 4051 × 8101 × 268501
The two smallest factors are: 3 x 5 ==15
