

A127640


Triangle read by rows in which row n contains n1 0's followed by prime(n).


7



2, 0, 3, 0, 0, 5, 0, 0, 0, 7, 0, 0, 0, 0, 11, 0, 0, 0, 0, 0, 13, 0, 0, 0, 0, 0, 0, 17, 0, 0, 0, 0, 0, 0, 0, 19, 0, 0, 0, 0, 0, 0, 0, 0, 23, 0, 0, 0, 0, 0, 0, 0, 0, 0, 29, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 31, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 37, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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OFFSET

1,1


COMMENTS



LINKS



EXAMPLE

First few rows of the triangle are:
2;
0, 3
0, 0, 5;
0, 0, 0, 7;
0, 0, 0, 0, 11;
...


MAPLE

A127640 := proc(n, m) if m < n then 0; else ithprime(n) ; fi ; end: for n from 1 to 15 do for m from 1 to n do printf("%d, ", A127640(n, m)) ; od ; od ; # R. J. Mathar, May 19 2007


CROSSREFS



KEYWORD



AUTHOR



EXTENSIONS



STATUS

approved



