login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A067859 a(1) = 1; a(n+1) = floor(sqrt(Sum_{k=1..n} a(k)^2)). 0
1, 1, 1, 1, 2, 2, 3, 4, 6, 8, 11, 16, 22, 31, 44, 62, 87, 123, 174, 246, 348, 492, 695, 983, 1390, 1966, 2780, 3931, 5559, 7862, 11118, 15723, 22236, 31446, 44471, 62892, 88942, 125783, 177884, 251566, 355768, 503132, 711536, 1006263, 1423071, 2012526, 2846142 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..47.

EXAMPLE

a(6) = floor(sqrt(1^2 + 1^2 + 1^2 + 1^2 + 2^2)) = floor(sqrt(8)) = 2.

MAPLE

a:= proc(n) option remember; `if`(n=1, 1,

      floor(sqrt(add(a(k)^2, k=1..n-1))))

    end:

seq(a(n), n=1..60);  # Alois P. Heinz, Aug 03 2018

CROSSREFS

Sequence in context: A173508 A103632 A214076 * A006207 A318403 A332755

Adjacent sequences:  A067856 A067857 A067858 * A067860 A067861 A067862

KEYWORD

easy,nonn

AUTHOR

Leroy Quet, Feb 15 2002

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 12 16:03 EDT 2020. Contains 335665 sequences. (Running on oeis4.)