Primes for which only three iterations of 'Prime plus its digit sum equals a prime' are possible.

Terms

a(0) =277a(1) =1559a(2) =5779a(3) =7489a(4) =11279a(5) =15091a(6) =22093a(7) =37811a(8) =43579a(9) =46279a(10) =48541a(11) =49957a(12) =53479a(13) =54751a(14) =60589a(15) =68473a(16) =72883a(17) =74821a(18) =83621a(19) =85621a(20) =90793a(21) =91921a(22) =93901a(23) =97501a(24) =107981a(25) =110899a(26) =111799a(27) =120193a(28) =153379a(29) =157739