Irregular primes whose indices are irregular primes of order one.

Terms

a(0) =613a(1) =877a(2) =1117a(3) =1721a(4) =1753a(5) =2153a(6) =2557a(7) =2671a(8) =4349a(9) =4943a(10) =5039a(11) =5179a(12) =5443a(13) =5641a(14) =5939a(15) =6037a(16) =6827a(17) =6997a(18) =7591a(19) =7853a(20) =8069a(21) =8209a(22) =8527a(23) =8669a(24) =9221a(25) =9311a(26) =9377a(27) =9859a(28) =10729a(29) =11149