OFFSET
1,1
COMMENTS
These are numbers n such that there are only two divisor pairs (d, n/d) [namely, the trivial pairs (1, n) and (n, 1)] that satisfy the condition that when their binary expansions are converted to (0,1)-polynomials (e.g., 13=1101[2] encodes X^3 + X^2 + 1), then their product is the (0,1)-polynomial similarly converted from n, when the multiplication is done over field GF(2).
LINKS
PROG
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, May 11 2019
STATUS
approved