This number is a prime.

Just showing those entries submitted by 'Loungrides': (Click here to show all)

+ The smallest prime formed by concatenating in descending order the first n consecutive numbers ending with 7, (case n=4, i.e., 37, 27, 17, 7). [Loungrides]

Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell