|
| |
|
|
A061288
|
|
Integer part of square root of n-th triangular number.
|
|
1
| |
|
|
1, 1, 2, 3, 3, 4, 5, 6, 6, 7, 8, 8, 9, 10, 10, 11, 12, 13, 13, 14, 15, 15, 16, 17, 18, 18, 19, 20, 20, 21, 22, 22, 23, 24, 25, 25, 26, 27, 27, 28, 29, 30, 30, 31, 32, 32, 33, 34, 35, 35, 36, 37, 37, 38, 39, 39, 40, 41, 42, 42, 43, 44, 44, 45, 46, 47, 47, 48, 49, 49, 50, 51, 51
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,3
|
|
|
EXAMPLE
| a(10) =7, The 10-th Triangular number is 55 and floor [sqrt(55)] = floor [7.4161]=7.
|
|
|
MAPLE
| for n from 1 to 150 do printf("%d, ", floor(sqrt(n*(n+1)/2))) od;
|
|
|
CROSSREFS
| Sequence in context: A005229 A091245 A100618 * A086525 A120503 A083544
Adjacent sequences: A061285 A061286 A061287 * A061289 A061290 A061291
|
|
|
KEYWORD
| nonn,easy
|
|
|
AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 25 2001
|
|
|
EXTENSIONS
| Corrected and extended by Larry Reeves (larryr(AT)acm.org), May 07 2001
|
| |
|
|
