Increasing sequence obtained by union of two sequences A136353 and {b(n)}, where b(n) is the smallest composite number m such that m-1 is prime and the set of distinct prime factors of m consists of the first n primes.
A136356
Increasing sequence obtained by union of two sequences A136353 and {b(n)}, where b(n) is the smallest composite number m such that m-1 is prime and the set of distinct prime factors of m consists of the first n primes.
Terms
- a(0) =4a(1) =6a(2) =9a(3) =15a(4) =30a(5) =105a(6) =420a(7) =1155a(8) =2310a(9) =15015a(10) =30030a(11) =255255a(12) =1021020a(13) =4849845a(14) =19399380a(15) =111546435a(16) =669278610a(17) =9704539845a(18) =38818159380a(19) =100280245065a(20) =601681470390
External references
- oeis: A136356