yes it only has 1 and itself as a factor
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1 and 313 (313 is a prime number).
1 and 313 - It is a prime number.
There are many pairs: 3 and 317 or 7 and 313
The happy prime numbers between 300 and 400 are as follows:313, 331, 367, 379, 383, 397
The twin prime pairs from 200 to 400 are (227, 229), (239, 241), (269, 271), (281, 283), (311, 313), (and 347, 349).