OFFSET
1,2
EXAMPLE
The first prime is 2, and the only triangular number that is 2-smooth is 1, so a(1) = 1.
The second prime is 3, and the only triangular numbers that are 3-smooth are 1, 3, 6 = 2 * 3, and 36 = 2^2 * 3^2, so a(2) = 2.
The third prime is 5, and the only triangular numbers that are 5-smooth are the 3-smooth triangular numbers and 10 = 2 * 5, 15 = 3 * 5, 45 = 3^2 * 5, 120 = 2^3 * 3 * 5, 300 = 2^2 * 3 * 5^2, and 3240 = 2^3 * 3^4 * 5, so a(3) = 3240.
CROSSREFS
KEYWORD
nonn
AUTHOR
Jon E. Schoenfield, Apr 22 2018
STATUS
approved