a(n) = product of primes p such that p^k <= n < 2*p^k for some k >= 1.

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =6a(5) =30a(6) =10a(7) =70a(8) =70a(9) =210a(10) =42a(11) =462a(12) =462a(13) =6006a(14) =858a(15) =858a(16) =858a(17) =14586a(18) =4862a(19) =92378a(20) =92378a(21) =92378a(22) =8398a(23) =193154a(24) =193154a(25) =965770a(26) =74290a(27) =222870a(28) =222870a(29) =6463230