486
This number is a composite.
The twin primes 6797727*2^15328 ± 1 were found on an ordinary IBM-compatible PC with an Intel 486 DX microprocessor.
The only sum of a zeroless pandigital expression involving
the addition of a Mersenne prime and a Sophie Germain
prime, i.e., 127 + 359 = 486. [Gaydos and
Honaker]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell