Mathematical Properties
276 = 15 + 25 + 35
276 is a triangular number, hexagonal number, centered pentagonal number and untouchable number.
It is the lowest number whose aliquot sequence has not yet been fully determined.
It is the sum of twelve consecutive prime numbers (5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37 + 41 + 43).
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