OFFSET
1,1
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
Chris K. Caldwell and G. L. Honaker, Jr., Prime Curio for 13361
EXAMPLE
a(2)=2105 because the semiprime 10 inserted between its ordered prime factors (2 and 5) is a semiprime.
PROG
(PARI) issemi(n)=bigomega(n)==2
list(lim)=my(v=List(), t); forprime(q=2, sqrtint(lim\10), forprime(p=2, min(sqrtint(lim\q), q), t=eval(Str(p, p*q, q)); if(t>lim, next(2)); if(issemi(t), listput(v, t)))); vecsort(Vec(v)) \\ Charles R Greathouse IV, Oct 04 2013
CROSSREFS
KEYWORD
nonn,base
AUTHOR
G. L. Honaker, Jr., Oct 03 2013
EXTENSIONS
More terms from Farideh Firoozbakht Oct 04 2013
STATUS
approved