1927

This number is a composite.

The brilliant number 1927 = 41 * 47 = 2^11 - 11^2. Note also that 1927 is an emirpimes because its reversal 7291 = 23 * 317 is also semiprime. [Post]

Number theorist Alexander Ivanovich Skopin (born in 1927) became interested in problems concerning the structure of the lower central series of groups of the Burnside type, that is groups of prime-power exponent. At that time, a positive solution of the restricted Burnside problem was known only for a prime exponent. [Post]