a(n) = smallest number > a(n-1) such that a(1)*a(2)*...*a(n) + 1 and a(1)*a(2)*...*a(n) - 1 are primes.
A051956
a(n) = smallest number > a(n-1) such that a(1)*a(2)*...*a(n) + 1 and a(1)*a(2)*...*a(n) - 1 are primes.
Terms
- a(0) =4a(1) =15a(2) =17a(3) =19a(4) =29a(5) =57a(6) =77a(7) =285a(8) =318a(9) =354a(10) =379a(11) =405a(12) =520a(13) =521a(14) =595a(15) =625a(16) =938a(17) =1706a(18) =1738a(19) =2085a(20) =2345a(21) =2817a(22) =4319a(23) =4529a(24) =7005a(25) =8207a(26) =8232a(27) =9451a(28) =9839a(29) =11044
External references
- oeis: A051956