The polynomial [read slowly] x to the n plus y to the n is irreducible over the reals if and only if n is one of these numbers. Every known almost perfect number is one of (-5[1])these numbers. The cardinality of the power set of any finite set is one of (-5[3])these numbers. These numbers appear in the exponent in the formula for Fermat numbers, (-5[1])while Mersenne primes are defined as being one less than these numbers. The sum along (-5[1])any row of Pascal’s triangle is equal to one of these numbers. These are the (10[1])only integers with no odd (-5[1])prime factors. In binary, these numbers consist of a one followed by all zeros. For 10 points, name these numbers which include (10[1])4, 8 and 16, obtained by repeated multiplication by the smallest even (10[4]0[2])number. ■END■