Mountain primes.

Terms

a(0) =131a(1) =151a(2) =181a(3) =191a(4) =1231a(5) =1291a(6) =1321a(7) =1361a(8) =1381a(9) =1451a(10) =1471a(11) =1481a(12) =1531a(13) =1571a(14) =1621a(15) =1721a(16) =1741a(17) =1831a(18) =1861a(19) =1871a(20) =1931a(21) =1951a(22) =12391a(23) =12421a(24) =12451a(25) =12491a(26) =12541a(27) =12641a(28) =12671a(29) =12721