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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“It is by a mathematical point only that we are wise, as the sailor or the fugitive slave keeps the polestar in his eye; but that is sufficient guidance for all our life. We may not arrive at our port within a calculable period, but we would preserve the true course.”
—Henry David Thoreau (1817–1862)
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