a(n) is the least multiple of the n-th primorial such that both a(n)-1 and a(n)+1 are prime and the prime factors of a(n) do not exceed prime(n).
A382785
a(n) is the least multiple of the n-th primorial such that both a(n)-1 and a(n)+1 are prime and the prime factors of a(n) do not exceed prime(n).
Terms
- a(0) =4a(1) =6a(2) =30a(3) =420a(4) =2310a(5) =180180a(6) =4084080a(7) =106696590a(8) =892371480a(9) =103515091680
External references
- oeis: A382785