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A127721 Floor of square root of sum of squares of n consecutive numbers. 5
1, 2, 3, 5, 7, 9, 11, 14, 16, 19, 22, 25, 28, 31, 35, 38, 42, 45, 49, 53, 57, 61, 65, 70, 74, 78, 83, 87, 92, 97, 102, 106, 111, 116, 122, 127, 132, 137, 143, 148, 154, 159, 165, 171, 177, 183, 188, 194, 201, 207, 213, 219, 225, 232, 238, 245, 251, 258, 264, 271, 278 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Alois P. Heinz, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A000196(A000330(n)). - R. J. Mathar, Jan 28 2007

MAPLE

A000330 := proc(n) local i; add(i^2, i=0..n); end: A000196 := proc(n) floor(sqrt(n)); end: A127721 := proc(n) A000196(A000330(n)); end: for n from 1 to 30 do printf("%d, ", A127721(n)); od; # R. J. Mathar, Jan 28 2007

MATHEMATICA

a = {}; k = 0; Do[k = k + x^2; AppendTo[a, Floor[Sqrt[k]]], {x, 1, 150}]; a

CROSSREFS

Cf. A000196, A000330, A127719, A127720.

Sequence in context: A039786 A102422 A062427 * A292620 A241907 A065130

Adjacent sequences:  A127718 A127719 A127720 * A127722 A127723 A127724

KEYWORD

nonn

AUTHOR

Artur Jasinski, Jan 25 2007

STATUS

approved

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Last modified December 9 03:27 EST 2019. Contains 329872 sequences. (Running on oeis4.)