Happy primes up to 22

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

There is 3 happy primes smaller than 22.

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

List#

Table#

	1	2	3
1 - 3	7	13	19

Learn more about Happy primes.
All happy primes

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