65
This number is a composite.
Single Curio View: (Seek other curios for this number)
65 is the ONLY number which gives a prime square by adding as well as subtracting its reversal from it: 65 + 56 = 112, 65 - 56 = 32. [Gupta]
Submitted: 2001-08-20 15:06:02; Last Modified: 2023-02-18 00:38:10.
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell