OFFSET
1,1
COMMENTS
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..179 (terms below 10^22, calculated using data from Claude Goutier)
Claude Goutier, Compressed text file carm10e22.gz containing all the Carmichael numbers up to 10^22.
Wikipedia, Carmichael number.
Wikipedia, Lucas-Carmichael number.
EXAMPLE
m = 9857524690572481 is a term because it is a Carmichael number and it has at least 3 prime factors p, {13, 61, 433}, such that p+1 | m+1.
PROG
(Perl) use bigint; use ntheory ':all'; sub isok { my $m = $_[0]; is_carmichael($m) && (grep { ($m+1) % ($_+1) == 0 } factor($m)) >= 3 };
CROSSREFS
KEYWORD
nonn
AUTHOR
Daniel Suteu, Nov 25 2019
STATUS
approved