OFFSET
1,1
COMMENTS
All terms are odd, so it is a subsequence of A161945. - Michel Marcus, Oct 15 2013
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
EXAMPLE
183, 185 and 187 are 59th, 60th and 61st semiprimes,
287, 289 and 291 are 89th, 90th and 91st semiprimes,
319, 321 and 323 are 101st, 102nd and 103rd semiprimes.
PROG
(PARI) isok(n) = (bigomega(n) == 2) && (bigomega(n+1) != 2) && (bigomega(n+2) == 2) && (bigomega(n+3) != 2) && (bigomega(n+4) == 2); \\ Michel Marcus, Oct 15 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Dec 28 2007
STATUS
approved