a(1) = 2, a(n+1) = smallest multiple of a(n) using only prime digits (2,3,5,7).
A078232
a(1) = 2, a(n+1) = smallest multiple of a(n) using only prime digits (2,3,5,7).
Terms
- a(0) =2a(1) =22a(2) =352a(3) =23232a(4) =255552a(5) =23255232a(6) =232575575232
External references
- oeis: A078232