Primes p such that p, p+6, p+12, p+18 are consecutive primes and p=6*k+5 for some k.

Terms

a(0) =251a(1) =5381a(2) =6311a(3) =12641a(4) =13451a(5) =14741a(6) =15791a(7) =17471a(8) =23321a(9) =26171a(10) =56081a(11) =62201a(12) =75521a(13) =78791a(14) =82781a(15) =84431a(16) =89381a(17) =94421a(18) =95261a(19) =104711a(20) =115751a(21) =120551a(22) =121001a(23) =154061a(24) =162251a(25) =163841a(26) =179801a(27) =185051a(28) =187361a(29) =191021