a(1) =7, a(n) = smallest multiple of a(n-1) (not equal to 10^k*a(n-1)) obtained by inserting digits anywhere in a(n-1).
A080492
a(1) =7, a(n) = smallest multiple of a(n-1) (not equal to 10^k*a(n-1)) obtained by inserting digits anywhere in a(n-1).
Terms
- a(0) =7a(1) =77a(2) =1771a(3) =178871a(4) =1178938761
External references
- oeis: A080492