Smallest prime of the form n(n-1)(n-2)...(n-k)-1, or 0 if no such prime exists.

Terms

a(0) =2a(1) =3a(2) =19a(3) =5a(4) =41a(5) =7a(6) =71a(7) =89a(8) =109a(9) =11a(10) =17159a(11) =13a(12) =2729a(13) =239a(14) =271a(15) =17a(16) =5813a(17) =19a(18) =419a(19) =461a(20) =72681839a(21) =23a(22) =599a(24) =701a(25) =11793599a(26) =811a(27) =29a(28) =929a(29) =31a(31) =968330879