2127
This number is a composite.
Dropping all even digits from the decimal representation of 2127 leaves a prime number. [De Geest]
prime(2) * prime(127) = 2127. [Gupta]
2^2127+2127^2 is the largest non-titanic prime of form 2^x+x^2. [Loungrides]
The next year that is a sum of the first primes: 2 + 3 + 5
+ 7 + 11 + ... + 137 + 139 = AD 2127.
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell