400
This number is a composite.
Single Curio View: (Seek other curios for this number)
400 is the only known square of the form 1+p+p^2+p^3, where
p is prime or composite. (Note that p=1 yields a square,
but 1 is neither prime nor composite.) [Noe]
Submitted: 2009-03-16 16:09:35; Last Modified: 2009-03-17 00:25:42.
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell