Smallest semiprime (A001358) which is at the end of an arithmetic progression of n semiprimes.

Terms

a(0) =4a(1) =6a(2) =14a(3) =46a(4) =58a(5) =221a(6) =445a(7) =497a(8) =1211a(9) =1561a(10) =4195a(11) =4393a(12) =6347a(13) =10717a(14) =14233a(15) =28213a(16) =31451a(17) =72965a(18) =119029a(19) =121603a(20) =124177a(21) =611261a(22) =632171a(23) =2003171a(24) =2012771a(25) =7466993a(26) =7619243a(27) =7771493a(28) =7923743a(29) =68029097