A127723 Floor of square root of sum of squares of the first n consecutive even numbers.
2, 4, 7, 10, 14, 19, 23, 28, 33, 39, 44, 50, 57, 63, 70, 77, 84, 91, 99, 107, 115, 123, 131, 140, 148, 157, 166, 175, 184, 194, 204, 213, 223, 233, 244, 254, 265, 275, 286, 297, 308, 319, 331, 342, 354, 366, 377, 389, 402, 414, 426, 439, 451, 464, 477, 490, 503
Offset: 1
Keywords
Programs
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Mathematica
a = {}; k = 0; Do[k = k + x^2; AppendTo[a, Floor[Sqrt[k]]], {x, 2, 150, 2}]; a Floor[Sqrt[#]]&/@Accumulate[Range[2,120,2]^2] (* Harvey P. Dale, Nov 04 2012 *)
Extensions
Definition clarified by Harvey P. Dale, Nov 04 2012