1957
This number is a composite.
1957 was the year the Cullen number C141 was proved to be prime (the first Cullen prime after the first Cullen number).
Printed from the PrimePages <t5k.org> © G. L. Honaker and Reginald McLean
This number is a composite.
1957 was the year the Cullen number C141 was proved to be prime (the first Cullen prime after the first Cullen number).