Nonprimes such that it takes exactly 4 iterations of reverse-and-add digits to generate a prime.

Terms

a(0) =10031a(1) =10040a(2) =10190a(3) =10231a(4) =10390a(5) =10441a(6) =10480a(7) =10541a(8) =10721a(9) =10921a(10) =10970a(11) =11021a(12) =11030a(13) =11180a(14) =11221a(15) =11380a(16) =11431a(17) =11470a(18) =11531a(19) =11711a(20) =11911a(21) =11960a(22) =12020a(23) =12170a(24) =12370a(25) =12460a(26) =12521a(27) =12701a(28) =12901a(29) =12950