1000000087
This number is a prime.
1000000087 remains prime after appending and inserting the digit X in all possible positions at the
same time: X1X0X0X0X0X0X0X0X8X7X. This is valid for X=3 and for X=9, producing the following two primes 313030303030303038373 and 919090909090909098979. [Rivera]
1000000087 remains prime if you intertwine the sequence of primes from 2 to 23 (120305070110130170198237) [Rivera]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell