Happy primes up to 373

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

There is 18 happy primes smaller than 373.

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

List#

7, 13, 19, 23, 31, 79, 97, 103, 109, 139, 167, 193, 239, 263, 293, 313, 331, 367

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

Learn more about Happy primes.
All happy primes

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