OFFSET
2,2
EXAMPLE
a(2) = 1: The only representable integer is 5 = (2 + 1/3) * (2 + 1/7).
a(3) = 2: 9 and 11 can be represented; 9 = (2 + 1/9) * (2 + 1/13) * (2 + 1/19) and 10 other ways; 11 = (2 + 1/3)*(2 + 1/5)*(2 + 1/7) = (2 + 1/3)^2 * (2 + 1/49).
PROG
(PARI) see link in A355626.
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Hugo Pfoertner and Markus Sigg, Jul 16 2022
STATUS
approved