OFFSET
1,1
COMMENTS
These are composite numbers n such that b^(n-1) == 1 (mod n) and abs(b^((n-1)/2) mod n) <> 1 for every b coprime to n.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..131 from Daniel Lignon)
CROSSREFS
KEYWORD
nonn
AUTHOR
Daniel Lignon, Sep 09 2015
STATUS
approved