a(n) is the number of primitive solutions to the inverse Pythagorean equation 1/x^2 + 1/y^2 = 1/z^2 such that x <= y and x + y + z <= 10^n.
A341990
a(n) is the number of primitive solutions to the inverse Pythagorean equation 1/x^2 + 1/y^2 = 1/z^2 such that x <= y and x + y + z <= 10^n.
Terms
- a(0) =0a(1) =1a(2) =4a(3) =12a(4) =40a(5) =128a(6) =402a(7) =1278a(8) =4040a(9) =12776a(10) =40417a(11) =127803a(12) =404136a(13) =1277995a(14) =4041401a(15) =12779996a(16) =40413886a(17) =127799963
External references
- oeis: A341990