n*10^6-1, n*10^6-3, n*10^6-7 and n*10^6-9 are all prime.

Terms

a(0) =719a(1) =11225a(2) =16736a(3) =19304a(4) =29117a(5) =43496a(6) =64259a(7) =75542a(8) =88514a(9) =99803a(10) =119195a(11) =131051a(12) =153080a(13) =153179a(14) =154874a(15) =155720a(16) =162188a(17) =163091a(18) =163778a(19) =175214a(20) =200303a(21) =204098a(22) =221330a(23) =257135a(24) =258845a(25) =268559a(26) =276401a(27) =322454a(28) =357251a(29) =358217