Numbers k such that 1000k+1, 1000k+3, 1000k+7, 1000k+9 are all primes.

Terms

a(0) =13a(1) =1447a(2) =2062a(3) =5527a(4) =6760a(5) =8062a(6) =11554a(7) =11890a(8) =14467a(9) =23113a(10) =23482a(11) =24952a(12) =25150a(13) =28201a(14) =28300a(15) =31072a(16) =31576a(17) =36217a(18) =41584a(19) =41599a(20) =45331a(21) =50635a(22) =56914a(23) =66688a(24) =67639a(25) =69376a(26) =75079a(27) =80002a(28) =81157a(29) =82240