Numbers k such that k = n-th triangular number and last digits of k match n.
A219253
Numbers k such that k = n-th triangular number and last digits of k match n.
Terms
- a(0) =1a(1) =15a(2) =325a(3) =195625a(4) =43959376a(5) =4106490625a(6) =396606890625
External references
- oeis: A219253