1391
This number is a composite.
1391 is the smallest composite number ending in 1, 3, 7, or 9 that cannot be made prime by adding any multiple of 100 up to a thousand.
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell
This number is a composite.
1391 is the smallest composite number ending in 1, 3, 7, or 9 that cannot be made prime by adding any multiple of 100 up to a thousand.