a(n) is smallest integral radius of circle centered at (0,0) having 8n-4 lattice points on its circumference; a(n)/2 is smallest half-integral radius circle centered at (1/2,0) having 4n-2 lattice points; a(n)/3 is smallest third-integral radius circle centered at (1/3,0) having 2n-1 lattice points.
A046112
a(n) is smallest integral radius of circle centered at (0,0) having 8n-4 lattice points on its circumference; a(n)/2 is smallest half-integral radius circle centered at (1/2,0) having 4n-2 lattice points; a(n)/3 is smallest third-integral radius circle centered at (1/3,0) having 2n-1 lattice points.
Terms
- a(0) =1a(1) =5a(2) =25a(3) =125a(4) =65a(5) =3125a(6) =15625a(7) =325a(8) =390625a(9) =1953125a(10) =1625a(11) =48828125a(12) =4225a(13) =1105a(14) =6103515625a(15) =30517578125a(16) =40625a(17) =21125a(19) =203125a(22) =5525a(24) =274625
External references
- oeis: A046112