21st safe prime is 719
21st safe prime is 719.
719 is 21st safe prime, its corresponding Sophie Germain prime is 359.
Learn more about Safe primes.
Neighbours#
| 16712 | 17914 | 22712 | 26315 | 34711 |
| 35910 | 38315 | 46711 | 4797 | 50310 |
| 56313 | 5879 | 7199 | 8395 | 86313 |
| 88710 | 98312 | 101910 | 11879 | 128313 |
| 13078 | 13195 | 136713 | 143910 | 148719 |
Compare with#
| 16712 | 17914 | 22712 | 26315 | 34711 |
| 35910 | 38315 | 46711 | 4797 | 50310 |
| 56313 | 5879 | 7199 | 8395 | 86313 |
| 88710 | 98312 | 101910 | 11879 | 128313 |
| 13078 | 13195 | 136713 | 143910 | 148719 |
Related#
- Learn more about Safe primes
- Check first 50 safe primes
- Check safe primes up to 1000
- Check all safe primes