OFFSET
1,4
COMMENTS
Row n, for n>=2, contains A071625(n) terms.
LINKS
EXAMPLE
4200 = 2^3 * 3^1 * 5^2 * 7^1. The exponents of the prime factorization are therefore 3,1,2,1. Therefore row 4200 is (1,2,3).
Table begins:
0;
1;
1;
2;
1;
1;
1;
3;
2;
1;
1;
1, 2;
MATHEMATICA
Join[{0}, Flatten[Rest[Table[Union[Transpose[FactorInteger[n]][[2]]], {n, 100}]]]] (* Harvey P. Dale, Mar 19 2013 *)
PROG
(PARI) row(n) = if(n == 1, [0], Set(factor(n)[, 2])); \\ Amiram Eldar, Aug 04 2024
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Leroy Quet, Jan 07 2008
EXTENSIONS
More terms from Harvey P. Dale, Mar 19 2013
STATUS
approved