OFFSET
1,1
COMMENTS
Row sums = A007445, inverse Mobius transform of the primes: (2, 5, 7, 12, 13, 23, ...)
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
KEYWORD
AUTHOR
Gary W. Adamson, Jan 21 2007
EXTENSIONS
More terms from R. J. Mathar, Mar 14 2007
STATUS
approved