OFFSET
1,1
COMMENTS
Row sums = the primes. T(n,k) = 0 if k does not divide n. If k divides n, extract A007444(k) which become the nonzero terms of row n, sum = n-th prime. Example: The factors of 6 are (1, 2, 3 and 6) = k's for A007444(k) = (2 + 1 + 3 + 7) = p(6) = 13. A007444 = the Moebius transform of the primes, (2, 1, 3, 4, 9, 7, 15, 12, ...), as the right diagonal of A130071.
FORMULA
EXAMPLE
First few rows of the triangle:
2;
2, 1;
2, 0, 3;
2, 1, 0, 4;
2, 0, 0, 0, 9;
2, 1, 3, 0, 0, 7;
2, 0, 0, 0, 0, 0, 15;
2, 1, 0, 4, 0, 0, 0, 12;
2, 0, 3, 0, 0, 0, 0, 0, 18;
2, 1, 0, 0, 9, 0, 0, 0, 0, 17;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, May 05 2007
STATUS
approved