- A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways of writing it as a product, 1 × 5 or 5 × 1, involve 5 itself. However, 4 is composite because it is a product (2 × 2) in which both numbers are smaller than 4. Primes are central in number theory because of the fundamental theorem of arithmetic: every natural number greater than 1 is either a prime itself or can be factorized as a product of primes that is unique up to their order.
- Salix sitchensis Sanson ex Bong. (plants.sc.egov.usda.gov)
Willow Family (Salicaceae). Salix sitchensis is a large shrub or small tree, six to twenty-five feet high. The leaves are alternate, oblonceolate or narrowly ovate, two to five inches long, and usually sharp-pointed. The flowers appear before or with the leaves, on short leafy shoots, males are five centimeters long, and the females are eight centimeters long (Pojar & MacKinnon 1994). The bark is smooth, slightly furrowed, and scaly.