OFFSET
1,4
REFERENCES
N. J. A. Sloane, The Encyclopedia of Integer Sequences. New York: Academic Press (1995): Fig. M1722, "Multiplicative encoding of a triangular array"
LINKS
PlanetMath, Multiplicative encoding
EXAMPLE
Triangle begins:
{1}
{1, 1}
{3, 1, 1}
{4, 2, 1, 1}
{8, 4, 2, 1, 1}
{10, 5, 2, 1, 1, 1}
{15, 6, 3, 2, 1, 1, 1}
{16, 8, 3, 2, 1, 1, 1, 1}
Row 5 of the triangle is 8, 4, 2, 1, 1 because A039716(5) = 39916800 and 39916800 = 2^8 * 3^4 * 5^2 * 7^1 * 11^1.
MATHEMATICA
ColumnForm[Table[Take[Flatten[FactorInteger[Prime[n]! ]], {2, 2n, 2}], {n, 15}], Center]
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Alonso del Arte, Jan 22 2008
STATUS
approved