a(n+1) is equal to a(n) plus the number of primes between a(n) and 2*a(n) exclusively.

Terms

a(0) =2a(1) =3a(2) =4a(3) =6a(4) =8a(5) =10a(6) =14a(7) =17a(8) =21a(9) =26a(10) =32a(11) =39a(12) =48a(13) =57a(14) =71a(15) =85a(16) =101a(17) =121a(18) =144a(19) =171a(20) =200a(21) =232a(22) =272a(23) =314a(24) =363a(25) =419a(26) =483a(27) =553a(28) =637a(29) =727