Happy primes up to 929
Happy primes: Primes that eventually reach 1 under iteration of: x -> sum of squares of digits of x.
There is 34 happy primes smaller than 929.
List#
7, 13, 19, 23, 31, 79, 97, 103, 109, 139, 167, 193, 239, 263, 293, 313, 331, 367, 379, 383, 397, 409, 487, 563, 617, 653, 673, 683, 709, 739, 761, 863, 881, 907
Table#
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 - 10 | 7 | 13 | 19 | 23 | 31 | 79 | 97 | 103 | 109 | 139 |
| 11 - 20 | 167 | 193 | 239 | 263 | 293 | 313 | 331 | 367 | 379 | 383 |
| 21 - 30 | 397 | 409 | 487 | 563 | 617 | 653 | 673 | 683 | 709 | 739 |
| 31 - 40 | 761 | 863 | 881 | 907 |
Related#
- Learn more about Happy primes.
- All happy primes