Prime quartet leaders: largest number of a prime quartet.

Terms

a(0) =2999a(1) =3989a(2) =4799a(3) =4889a(4) =5879a(5) =5897a(6) =5987a(7) =6599a(8) =6689a(9) =6779a(10) =6869a(11) =6959a(12) =6977a(13) =7499a(14) =7589a(15) =7877a(16) =7949a(17) =8597a(18) =8669a(19) =8849a(20) =8867a(21) =9479a(22) =9497a(23) =9587a(24) =9677a(25) =9749a(26) =9767a(27) =9839a(28) =9857a(29) =9929