Triangular numbers that are 7 times triangular numbers.
A077400
Triangular numbers that are 7 times triangular numbers.
Terms
- a(0) =0a(1) =21a(2) =105a(3) =5460a(4) =26796a(5) =1386945a(6) =6806205a(7) =352278696a(8) =1728749400a(9) =89477401965a(10) =439095541521
External references
- oeis: A077400