OFFSET
1
COMMENTS
If a(x) = a(y) = 1 and gcd(x,y) = 1, then a(x*y) = 1 also. For example, we can take x = 372 = 2^2 * 3 * 31, y = 385 = 5 * 7 * 11, and x*y = 372*385 = 143220. On all these points, a(n) = 1.
LINKS
FORMULA
PROG
(PARI) A336355(n) = (omega(sigma(n))<omega(n));
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jul 20 2020
STATUS
approved