OFFSET
1,1
COMMENTS
Some terms may overlap: e.g., k=9 and k=10 both begin with p=175229 where p+4 = 175233.
FORMULA
For each p, the semiprime is p+4.
EXAMPLE
a(2)=33 because if p=29, then p+4 is 33 and semiprime (3*11).
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Enoch Haga, Jan 30 2008
EXTENSIONS
a(1) corrected by and a(11)-a(15) from Giovanni Resta, Jun 22 2018
STATUS
approved