Primorial numbers (second definition): n# = product of primes <= n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =6a(5) =30a(6) =30a(7) =210a(8) =210a(9) =210a(10) =210a(11) =2310a(12) =2310a(13) =30030a(14) =30030a(15) =30030a(16) =30030a(17) =510510a(18) =510510a(19) =9699690a(20) =9699690a(21) =9699690a(22) =9699690a(23) =223092870a(24) =223092870a(25) =223092870a(26) =223092870a(27) =223092870a(28) =223092870a(29) =6469693230