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# 125

This number is a composite.

125 = 11^{2} + 2^{2} (the sum of prime squares). [Sladcik]

125 = 5^{3} (a prime cube). It is the smallest
number which is both a sum of distinct prime squares and a prime cube. [Kulsha]

Conjecture by Zhi-Wei Sun to be the largest power
(5^{3}) for which there is no prime between it and
the previous power (11^{2}). The other prime gaps
between powers are in (2^{3}, 3^{2}),
(2^{5}, 6^{2}) and
(5^{2}, 3^{3}). [Caldwell]

(There are 2 curios for this number that have not yet been approved by an editor.)

Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell