Primes p such that (p+18), (p+36) and (p+72) are also prime.

Terms

a(0) =11a(1) =431a(2) =751a(3) =911a(4) =1051a(5) =2521a(6) =2731a(7) =3511a(8) =3761a(9) =4951a(10) =5261a(11) =7211a(12) =7681a(13) =9221a(14) =9461a(15) =9661a(16) =13451a(17) =13841a(18) =14851a(19) =15241a(20) =15731a(21) =15901a(22) =18181a(23) =19471a(24) =19681a(25) =20071a(26) =21121a(27) =23531a(28) =25621a(29) =25981