Numbers k such that k, k+1, k+2 and k+3 are 1,2,3,4-almost primes.

Terms

a(0) =193a(1) =421a(2) =661a(3) =1093a(4) =1657a(5) =2137a(6) =2341a(7) =2593a(8) =6217a(9) =7057a(10) =8101a(11) =9817a(12) =12421a(13) =12853a(14) =15121a(15) =16033a(16) =16417a(17) =17257a(18) =17881a(19) =19813a(20) =20641a(21) =21817a(22) =25033a(23) =25657a(24) =27337a(25) =28921a(26) =30661a(27) =31081a(28) =31321a(29) =31333