This number is a prime.
The roof of Chicago's Willis Tower is 1451 feet above ground level.
The other eleven permutations of the digits of 1451 are all
1451 is the lesser member of a twin prime pair: (1451,1453). Curiously, if we take the sum of digits of
both numbers, we also get a twin prime pair. [Anitha]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell