Prime numbers generated by concatenating k, k, and 9.

Terms

a(0) =229a(1) =449a(2) =11119a(3) =14149a(4) =22229a(5) =28289a(6) =31319a(7) =37379a(8) =44449a(9) =49499a(10) =52529a(11) =56569a(12) =67679a(13) =70709a(14) =71719a(15) =80809a(16) =86869a(17) =89899a(18) =94949a(19) =95959a(20) =1061069a(21) =1101109a(22) =1131139a(23) =1151159a(24) =1161169a(25) =1191199a(26) =1241249a(27) =1251259a(28) =1331339a(29) =1401409