Sum of the squares of the a(n)-th and the (a(n)+1)st triangular numbers (A000217) is a perfect square.
A065113
Sum of the squares of the a(n)-th and the (a(n)+1)st triangular numbers (A000217) is a perfect square.
Terms
- a(0) =6a(1) =40a(2) =238a(3) =1392a(4) =8118a(5) =47320a(6) =275806a(7) =1607520a(8) =9369318a(9) =54608392a(10) =318281038a(11) =1855077840a(12) =10812186006a(13) =63018038200a(14) =367296043198
External references
- oeis: A065113