Product of all composite numbers k such that n<k<prime(r) where prime(r-1)<=n, or 1 if this set of k is empty.
A109915
Product of all composite numbers k such that n<k<prime(r) where prime(r-1)<=n, or 1 if this set of k is empty.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =1a(4) =6a(5) =1a(6) =720a(7) =90a(8) =10a(9) =1a(10) =12a(11) =1a(12) =3360a(13) =240a(14) =16a(15) =1a(16) =18a(17) =1a(18) =9240a(19) =462a(20) =22a(21) =1a(22) =11793600a(23) =491400a(24) =19656a(25) =756a(26) =28a(27) =1a(28) =30a(29) =1
External references
- oeis: A109915