Primes occurring in exactly three prime triples (p,q,r) with p<q<r=p+6.

Terms

a(0) =11a(1) =13a(2) =17a(3) =103a(4) =107a(5) =1487a(6) =1873a(7) =3463a(8) =5653a(9) =15733a(10) =16063a(11) =16067a(12) =19423a(13) =19427a(14) =21017a(15) =22277a(16) =43783a(17) =43787a(18) =55337a(19) =79693a(20) =88813a(21) =101113a(22) =144167a(23) =165707a(24) =166847a(25) =195737a(26) =201827a(27) =225347a(28) =247607a(29) =257863