a(n) is the least number with exactly two distinct base-10 digits and exactly n distinct prime factors, or -1 if there is no such number.
A386761
a(n) is the least number with exactly two distinct base-10 digits and exactly n distinct prime factors, or -1 if there is no such number.
Terms
- a(0) =13a(1) =10a(2) =30a(3) =330a(4) =6006a(5) =30030a(6) =1111110a(7) =200222022a(8) =1001110110a(9) =955559599995
External references
- oeis: A386761