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A127723
Floor of square root of sum of squares of the first n consecutive even numbers.
0
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
1,1
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 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, Jan 25 2007
EXTENSIONS
Definition clarified by Harvey P. Dale, Nov 04 2012
STATUS
approved