If the sum of the squares of 4 consecutive numbers is a triangular number t(u), then a(n) is its index u.
A201632
If the sum of the squares of 4 consecutive numbers is a triangular number t(u), then a(n) is its index u.
Terms
- a(0) =35a(1) =83a(2) =1203a(3) =2835a(4) =40883a(5) =96323a(6) =1388835a(7) =3272163a(8) =47179523a(9) =111157235a(10) =1602714963a(11) =3776073843a(12) =54445129235a(13) =128275353443
External references
- oeis: A201632