|
|
A137628
|
|
Semiprimes (p+4) associated with last prime in A137626.
|
|
3
|
|
|
6, 35, 185, 737, 1781, 8367, 8373, 19277, 175337, 175353, 33952823, 4377722981, 4377723017, 1242030992721, 1242030992727
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
FORMULA
|
For each p, the semiprime is p + 4.
|
|
EXAMPLE
|
a(2)=35 because when p=29 (resp. 31), p+4=33 (resp. 35) and are semiprime (3*3 resp. 5*7).
|
|
CROSSREFS
|
|
|
KEYWORD
|
more,nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|