OFFSET
1,1
FORMULA
T(n, 1) = prime(n)
T(n, n) = prime(n)# where p# denotes the primorial of p.
EXAMPLE
2,
3, 6,
5, 10, 30,
7, 15, 42, 210,
11, 22, 70, 330, 2310,
13, 35, 110, 462, 2730, 30030,
...
To find T(3, 2), we seek for the product of two primes prime(i) and prime(j) such that i + j = n + 0 + 1 = 4. This can be prime(1) * prime(3) = 2 * 5 = 10 and prime(2) * prime(2) = 3 * 3 = 9. The maximum is 10 so T(3, 2) = 10.
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
David A. Corneth, Jun 30 2016
STATUS
approved