OFFSET
1,1
EXAMPLE
First semiprime is 4; 4 is 2*2 -> 22.
Second semiprime is 6; 6 is 3*2 -> 32.
Third semiprime is 9; 9 is 3*3 -> 33.
Fourth semiprime is 10; 10 is 5*2 -> 52.
PROG
(PARI) glue(a, b)=10^#Str(b)*a+b;
for(n=4, 1e3, if(bigomega(n)==2, f=factor(n)[, 1]; print1(glue(f[#f], f[1])", "))) \\ Charles R Greathouse IV, Oct 04 2011
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Eric Angelini, May 09 2005
STATUS
approved