The name "Euler prime" is used here for a prime number generated by Euler's prime-generating
polynomial
for a nonnegative integer
.
(Note that such primes are distinct from prime
Euler numbers, which are known here as Euler
number primes). Then the first few Euler primes occur for
,
1, 2, ..., 39, 42, 43, 45, ... (OEIS A056561),
corresponding to the primes 41, 43, 47, 53, 61, 71,
83, 97, 113, 131, 151, 173, ... (OEIS A005846).
As of Feb. 2013, the largest known Euler prime is ,
which has 398204 decimal digits and was found by
D. Broadhurst (https://t5k.org/primes/page.php?id=111195).