|
|
A227943
|
|
Semiprimes associated with A227942.
|
|
2
|
|
|
9, 10, 14, 15, 25, 35, 58, 62, 82, 94, 39, 57, 93, 65, 85, 95, 91, 106, 122, 142, 158, 166, 194, 141, 159, 177, 183, 201, 219, 237, 267, 291, 205, 235, 295, 305, 335, 365, 395, 415, 445, 203, 259, 329, 371, 413, 497, 143, 319, 341, 473, 583, 671, 869, 913, 979
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
PROG
|
(PARI) issemi(n)=bigomega(n)==2
do(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, p*q])))); apply(u->u[2], vecsort(Vec(v), 1)) \\ Charles R Greathouse IV, Oct 04 2013
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|