OFFSET
1,2
COMMENTS
A multiplicative semigroup: if m and n are in the sequence, then so is m*n.
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..20000
PROG
(PARI) isA373590(n) = if(bigomega(n)%3, 0, my(f = factor(n)); for(i = 1, #f~, if((f[i, 1]%3) != 1, return(0))); (1));
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jun 10 2024
STATUS
approved