Integers which are exactly the concatenation of the first m even numbers (A019520) divided by their sum (A002378 = m^2+m).
A072724
Integers which are exactly the concatenation of the first m even numbers (A019520) divided by their sum (A002378 = m^2+m).
Terms
- a(0) =1a(1) =4a(2) =8227a(3) =3427918353
External references
- oeis: A072724