a(n) is the smallest prime p > a(n-1) such that p - a(n-1) is an (n-1)-almost prime; a(1) = 2.

Terms

a(0) =2a(1) =5a(2) =11a(3) =19a(4) =43a(5) =151a(6) =311a(7) =439a(8) =823a(9) =2551a(10) =6007a(11) =12919a(12) =23159a(13) =35447a(14) =92791a(15) =203383a(16) =535159a(17) =731767a(18) =1124983a(19) =5253751a(20) =6302327a(21) =16919159a(22) =32647799a(23) =103426679a(24) =160049783a(25) =285878903a(26) =386542199a(27) =1066019447a(28) =1468672631a(29) =2676632183