1207
This number is a composite.
The second smallest semiprime whose factors (17 and 71) form a pair of emirps. [Toews]
The greatest common divisor of the 2nd and 3rd smallest Carmichael numbers of order 2, namely 39671149333495681 and 842526563598720001. [Hasler]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell