Happy primes up to 80

Happy primes: Primes that eventually reach 1 under iteration of: x -> sum of squares of digits of x.

There is 6 happy primes smaller than 80.

Checkout happy primes up to: 100, 500, 1000, 10000.

List#

7, 13, 19, 23, 31, 79

Table#

 123456
1 - 671319233179
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