276 (number)

276 (two hundred [and] seventy-six) is the natural number following 275 and preceding 277.

In mathematics
276 is the sum of 3 consecutive fifth powers (276 = 15 + 25 + 35). As a figurate number it is a triangular number, a hexagonal number, and a centered pentagonal number, the third number after 1 and 6 to have this combination of properties.

276 is the size of the largest set of equiangular lines in 23 dimensions. The maximal set of such lines, derived from the Leech lattice, provides the highest dimension in which the "Gerzon bound" of $\binom{n+1}{2}$ is known to be attained; its symmetry group is the third Conway group, Co3.

276 is the smallest number for which it is not known if the corresponding aliquot sequence either terminates or ends in a repeating cycle.

In the Bible
In Acts 27 verses 37-44 the Bible refers to 276 people on board a ship all of which made it to safety after the ship ran aground.

In other fields
In the Christian calendar, there are 276 days from the Annunciation on March 25 to Christmas on December 25, a number considered significant by some authors.