|
|
A075556
|
|
Smallest prime p not occurring earlier such that p+n is a square, or 0 if no such p exists.
|
|
1
|
|
|
3, 2, 13, 5, 11, 19, 29, 17, 7, 71, 53, 37, 23, 67, 181, 0, 47, 31, 557, 61, 43, 59, 41, 97, 0, 199, 73, 197, 167, 139, 113, 89, 163, 191, 109, 0, 107, 83, 157, 401, 103, 79, 101, 317, 151, 179, 149, 241, 0, 239, 349, 173, 271, 307, 269, 233, 619, 383, 137, 229
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
PROG
|
(PARI) v=vector(1000000):for(n=1, 100, f=0:forprime(p=2, 1000000, if(!v[p]&&issquare(p+n), f=p:break)): if(f, print1(f", "):v[f]=1, print1("0, ")))
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|