|
|
A363353
|
|
Numbers k such that 10^k + 3 is a semiprime.
|
|
1
|
|
|
3, 4, 7, 8, 10, 15, 16, 21, 27, 30, 37, 42, 43, 54, 66, 77, 96, 114, 130, 132, 155, 156, 168, 182, 213, 294
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
EXAMPLE
|
a(3) = 7 is a term because 10^7 + 3 = 13 * 769231 is a semiprime.
|
|
MAPLE
|
select(t -> numtheory:-bigomega(10^t+3) = 2, [$1..70]);
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,more
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|