|
| |
|
|
A143544
|
|
Triangle read by rows, T(n,k) = 2 if n is prime, 1 otherwise; 1<=k<=n.
|
|
1
| |
|
|
1, 2, 2, 2, 2, 2, 1, 1, 1, 1, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2
(list; table; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
COMMENTS
| Row sums = A143545: (1, 4, 6, 4, 10, 6, 14,...) = componentwise addition of (1, 2, 3, 4, 5,...) and A061397: (0, 2, 3, 0, 5, 0, 7,...).
|
|
|
FORMULA
| Triangle read by rows, T(n,k) = 2 if n is prime, 1 otherwise; 1<=k<=n
|
|
|
EXAMPLE
| First few rows of the triangle =
1;
2, 2;
2, 2, 2;
1, 1, 1, 1;
2, 2, 2, 2, 2;
1, 1, 1, 1, 1, 1;
2, 2, 2, 2, 2, 2, 2;
...
|
|
|
CROSSREFS
| Cf. A061397, A143545.
Sequence in context: A063059 A102675 A177849 * A031346 A087472 A172069
Adjacent sequences: A143541 A143542 A143543 * A143545 A143546 A143547
|
|
|
KEYWORD
| nonn,tabl
|
|
|
AUTHOR
| Gary W. Adamson (qntmpkt(AT)yahoo.com), Aug 23 2008
|
| |
|
|
