276

276 = 2² x 3 x 23.

276 is the 23rd triangular number.

276 is the magic sum of a magic square made up of 16 consecutive primes.

276 is the largest difference between two consecutive primes less than 10⁹.

276 = 1⁵ + 2⁵ + 3⁵.

Loctite 276 is an adhesive for the permanent locking and sealing of threaded fasteners.

Source: Prime Curios!