First 27 happy primes
Happy primes: Primes that eventually reach 1 under iteration of: x -> sum of squares of digits of x.
First 27 happy primes have values between 7 and 673.
Checkout list of first: 10, 50, 100, 500, 1000 happy primes. You can also check all happy primes.
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
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 |
Related#
- Learn more about Happy primes.
- All happy primes