Primes occurring in A084704 exactly 4 times.

Terms

a(0) =1223a(1) =1907a(2) =2423a(3) =4079a(4) =7993a(5) =11383a(6) =14431a(7) =20113a(8) =20359a(9) =22189a(10) =23209a(11) =26993a(12) =28603a(13) =29339a(14) =30259a(15) =31013a(16) =33211a(17) =33629a(18) =35083a(19) =35353a(20) =39191a(21) =40177a(22) =42797a(23) =44549a(24) =47963a(25) =49663a(26) =51283a(27) =52027a(28) =52727a(29) =53077