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

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =8a(5) =10a(6) =14a(7) =17a(8) =22a(9) =28a(10) =35a(11) =43a(12) =53a(13) =65a(14) =78a(15) =93a(16) =111a(17) =129a(18) =153a(19) =179a(20) =210a(21) =245a(22) =285a(23) =328a(24) =381a(25) =441a(26) =508a(27) =582a(28) =668a(29) =764