a(n) is the number of pairs x <= y of n-digit numbers such that the number of distinct digits in their product is less than in their concatenation.
A370678
a(n) is the number of pairs x <= y of n-digit numbers such that the number of distinct digits in their product is less than in their concatenation.
Terms
- a(0) =10a(1) =1395a(2) =147718a(3) =15187437a(4) =1530456465a(5) =152653821364
External references
- oeis: A370678