21st additive prime is 157
21st additive prime is 157.
157 is 21st additive prime because sum of its digits is 13 which is also prime.
Learn more about Additive primes.
Neighbours#
| 4313 | 4722 | 6113 | 6718 | 8311 |
| 899 | 10120 | 11322 | 13113 | 1379 |
| 1397 | 15110 | 15712 | 17310 | 17914 |
| 19117 | 19319 | 19714 | 19911 | 22314 |
| 22712 | 22910 | 24111 | 26315 | 26911 |
Compare with#
| 4313 | 4722 | 6113 | 6718 | 8311 |
| 899 | 10120 | 11322 | 13113 | 1379 |
| 1397 | 15110 | 15712 | 17310 | 17914 |
| 19117 | 19319 | 19714 | 19911 | 22314 |
| 22712 | 22910 | 24111 | 26315 | 26911 |
Related#
- Learn more about Additive primes
- Check first 50 additive primes
- Check additive primes up to 500
- Check all additive primes