|
| |
|
|
A127639
|
|
A051731 * A127640, where A127640 = infinite lower triangular matrix with the sequence of primes in the main diagonal and the rest zeros.
|
|
5
|
|
|
|
2, 2, 3, 2, 0, 5, 2, 3, 0, 7, 2, 0, 0, 0, 11, 2, 3, 5, 0, 0, 13, 2, 0, 0, 0, 0, 0, 17, 2, 3, 0, 7, 0, 0, 0, 19, 2, 0, 5, 0, 0, 0, 0, 0, 23, 2, 3, 0, 0, 11, 0, 0, 0, 0, 29, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 31, 2, 3, 5, 7, 0, 13, 0, 0, 0, 0, 0, 37, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 41, 2, 3, 0, 0, 0, 0, 17, 0, 0
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
COMMENTS
|
Row sums = A007445, inverse Mobius transform of the primes: (2, 5, 7, 12, 13, 23,...)
|
|
|
LINKS
|
Table of n, a(n) for n=1..100.
|
|
|
EXAMPLE
|
First few rows of the triangle are:
2;
2, 3;
2, 0, 5;
2, 3, 0, 7;
2, 0, 0, 0, 11;
2, 3, 5, 0, 0, 13;
...
|
|
|
MAPLE
|
A051731 := proc(n, k) if n mod k = 0 then 1 ; else 0 ; fi ; end: A127639 := proc(n, k) A051731(n, k)*ithprime(k) ; end: for n from 1 to 16 do for k from 1 to n do printf("%d, ", A127639(n, k)) ; od ; od ; - R. J. Mathar, Mar 14 2007
|
|
|
CROSSREFS
|
Cf. A051731, A007445, A127639.
Sequence in context: A007906 A098008 A127638 * A100890 A076494 A217721
Adjacent sequences: A127636 A127637 A127638 * A127640 A127641 A127642
|
|
|
KEYWORD
|
nonn,tabl,easy
|
|
|
AUTHOR
|
Gary W. Adamson, Jan 21 2007
|
|
|
EXTENSIONS
|
More terms from R. J. Mathar, Mar 14 2007
|
|
|
STATUS
|
approved
|
| |
|
|
