9
This number is a composite.
Single Curio View: (Seek other curios for this number)
The smallest composite number n such that both
2n+n and 2n-n are prime. That is,
29+9 = 521 and 29-9 = 503 are prime. [Poo Sung]
Submitted: 2009-06-03 07:02:59; Last Modified: 2009-06-03 10:56:56.
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell