a(n) is the smallest multiple of 7 that can be formed by concatenating the first n positive integers in some order.
A350570
a(n) is the smallest multiple of 7 that can be formed by concatenating the first n positive integers in some order.
Terms
- a(0) =21a(1) =231a(2) =3241a(3) =12453a(4) =123564a(5) =1234576a(6) =12347685a(7) =123456879a(8) =10123456798
External references
- oeis: A350570