1019

1021

1031

1033

32^2 + 3^2

1039

1049

Each digit is a perfect square, and there is no smaller 4-digit prime with that property.

1051

1061

1063

1069

With digits reversed (9601) you get a different prime. 1069 is the smallest 4-digit number with this property.

1087

1091

1093

1097

1103

I can't believe this thread got so far. And with so few mistakes.

1109

1117...May be we get a call from some Cryptography or Security Co. :P

1123 The FBI will investigate this thread.

1129

At the border of a prime desert. I.e., relatively speaking, it's a long way to the next prime.

From the other side of the world... 1151

1153

33^2 + (2^3)^2

Seems like everything can be broken into 2s and 3s.

1163

1171

The smallest 4-digit prime such that any substring of length 2 yields only distinct primes (11, 17, 71).

Where do you come up with this stuff?

1181

1187

1193

Reversed, it's also a prime (3911). By itself that's not big news. But the same fact holds for the next 9 primes (10 reversi-primes in a row, starting here) which we will see as we proceed...

1201

1213

The smallest 4-digit prime comprised of consecutive numbers (12,13).

1217

1217

1223

Are we only 4?

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