10000...00027 (84-digits)
This number is a prime.
1000 0000000000
0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000027
If we concatenate the month and (two digit) day of the 27th October, we get 1027, a composite number. If zeros are inserted between the day and the year, 80 are required before a prime number is reached. This is more than for any other day of the year, with the possible exception of 1 October. [Hartley]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell