OFFSET
1,3
COMMENTS
EXAMPLE
For k=9 and j=640, j^k = 640^9 = (2^7 * 5)^9 = 2^63 * 5^9, which has exactly (63+1)*(9+1) = 64*10 = 640 = j divisors, so k=9 is a term.
There exists no j > 1 such that j^14 has exactly j divisors, so 14 is not a term.
CROSSREFS
KEYWORD
nonn
AUTHOR
Jon E. Schoenfield, Jan 26 2019
STATUS
approved