Beginnings of maximal chains of primes with three members (two links).

Terms

a(0) =5a(1) =43a(2) =139a(3) =227a(4) =277a(5) =773a(6) =947a(7) =991a(8) =1237a(9) =1481a(10) =1549a(11) =1601a(12) =1871a(13) =1993a(14) =2339a(15) =3119a(16) =3169a(17) =3217a(18) =3259a(19) =3371a(20) =3709a(21) =3853a(22) =4013a(23) =4219a(24) =4483a(25) =4951a(26) =5051a(27) =5107a(28) =5147a(29) =5419