Numbers k such that k+1, k+3, k+7 and k+9 are all primes.

Terms

a(0) =4a(1) =10a(2) =100a(3) =190a(4) =820a(5) =1480a(6) =1870a(7) =2080a(8) =3250a(9) =3460a(10) =5650a(11) =9430a(12) =13000a(13) =15640a(14) =15730a(15) =16060a(16) =18040a(17) =18910a(18) =19420a(19) =21010a(20) =22270a(21) =25300a(22) =31720a(23) =34840a(24) =43780a(25) =51340a(26) =55330a(27) =62980a(28) =67210a(29) =69490