1311
This number is a composite.
Just showing those entries submitted by 'Homewood': (Click here to show all)
The concatenation of the first and second primes multiplied
by the concatenation of the third and fourth primes equals
the concatenation of the fifth and sixth primes in reverse
order: 23 * 57 = 1311. [Homewood]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Reginald McLean