Irregular primes the indices of whose indices are irregular primes of order two.

Terms

a(0) =12923a(1) =19577a(2) =26021a(3) =41203a(4) =41953a(5) =53437a(6) =65309a(7) =68399a(8) =117511a(9) =134731a(10) =137713a(11) =142327a(12) =149861a(13) =155821a(14) =164701a(15) =167887a(16) =192347a(17) =197647a(18) =216901a(19) =224911a(20) =231323a(21) =236063a(22) =246049a(23) =250031a(24) =268999a(25) =271723a(26) =273787a(27) =289543a(28) =317959a(29) =331519