10000...00101 (190-digits)
This number is a prime.
1000000000 0000000001 0000000000 0000000100 0000000000
0000100000 0000000000 1000000000 0000010000 0000000001 0000000000 0010000000
0000100000 0000010000 0000010000 0000100000 0010000001 0000010000 1000100101
This prime number is the concatentation of the first 19 powers of 10 in reverse. Note that it has 190 digits, which is 19 times 10. [Hartley]
19 ones seperated by 18, 17, 16,..., 1 zeros is prime. [Vrba]
(There are 4 curios for this number that have not yet been approved by an editor.)
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell