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

A035497

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

Terms

    a(0) =7a(1) =13a(2) =19a(3) =23a(4) =31a(5) =79a(6) =97a(7) =103a(8) =109a(9) =139a(10) =167a(11) =193a(12) =239a(13) =263a(14) =293a(15) =313a(16) =331a(17) =367a(18) =379a(19) =383a(20) =397a(21) =409a(22) =487a(23) =563a(24) =617a(25) =653a(26) =673a(27) =683a(28) =709a(29) =739

External references