Product of primes p satisfying n <= p <= 2n.

Terms

a(0) =2a(1) =6a(2) =15a(3) =35a(4) =35a(5) =77a(6) =1001a(7) =143a(8) =2431a(9) =46189a(10) =46189a(11) =96577a(12) =96577a(13) =7429a(14) =215441a(15) =6678671a(16) =6678671a(17) =392863a(18) =14535931a(19) =765049a(20) =31367009a(21) =1348781387a(22) =1348781387a(23) =2756205443a(24) =2756205443a(25) =2756205443a(26) =146078888479a(27) =146078888479a(28) =146078888479a(29) =297194980009