28229
This number is a prime.
The largest known prime partial sum of Proth primes: 3 + 5
+ 13 + 17 + 41 + 97 + 113 + 193 + 241 + 257 + 353 + 449 +
577 + 641 + 673 + 769 + 929 + 1153 + 1217 + 1409 + 1601 +
2113 + 2689 + 2753 + 3137 + 3329 + 3457 = 28229 is prime,
but not a Proth prime. After the trivial 3, what is the
smallest Proth prime partial sum of Proth primes? [Post]
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