Numbers k such that k+1, 2k+1, 3k+1, 4k+1 are all prime.

Terms

a(0) =330a(1) =1530a(2) =3060a(3) =4260a(4) =4950a(5) =6840a(6) =10830a(7) =15390a(8) =18120a(9) =23010a(10) =25410a(11) =26040a(12) =31770a(13) =33300a(14) =40110a(15) =41490a(16) =45060a(17) =49830a(18) =53880a(19) =59340a(20) =65850a(21) =70140a(22) =73770a(23) =78540a(24) =88740a(25) =95460a(26) =96930a(27) =109470a(28) =111720a(29) =112620