Numbers k such that there are no prime numbers between reverse(k) and 3*k.

Terms

a(0) =0a(1) =14a(2) =247a(3) =298a(4) =1003a(5) =2998a(6) =10003a(7) =12473a(8) =17525a(9) =19995a(10) =27528a(11) =29998a(12) =199995a(13) =299998a(14) =1000003a(15) =1824745a(16) =1875265a(17) =1999995a(18) =2124736a(19) =2475247a(20) =2700018a(21) =3124739a(22) =10000003a(23) =12999983a(24) =19999995a(25) =29999998a(26) =30000009a(27) =124752473a(28) =140000024a(29) =170000015