52609
This number is a prime.
If we reverse the prime 52609 and square (906252 = 8212890625),
the last five digits are 52609 reversed. Note that 82128906252 = 67451572418212890625 ends
in 8212890625, while 5260982128142751547 (its reversal without the 6 on the end) is prime! [Kulsha]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell