A127723 - OEIS

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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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..57.

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

Cf. A127719, A127720, A127721, A127722.

Sequence in context: A144873 A120679 A145106 * A076268 A323623 A055607

Adjacent sequences: A127720 A127721 A127722 * A127724 A127725 A127726