An emirpimes ("semiprime" spelled backwards) is a semiprime whose (base 10) reversal is
a different semiprime. The first such number is 15,
because 15 reversed is 51 and both 15 and 51 are semiprimes
(i.e., 
and 
). The first emirpimeses (or "semirpimes")
are 15, 26, 39, 49, 51, 58, 62, 85, 93, 94, 115, 122, 123, ... (OEIS A097393).
A binary plot of the semirpimes is illustrated above.
The numbers of semirpimes less than 
for 
, 2, ... are 0, 10, 90, 898, 7200, 60732, ... (OEIS A097394).
