OFFSET
1,1
COMMENTS
Also known as extended Chernick Carmichael numbers.
Each term of this sequence is the product of 3 or more distinct prime factors.
LINKS
Daniel Suteu, Table of n, a(n) for n = 1..10081
Jack Chernick, On Fermat's simple theorem, Bull. Amer. Math. Soc. 45:4 (1939), pp. 269-274.
Daniel Suteu, Perl program
Eric Weisstein's World of Mathematics, Carmichael Number
CROSSREFS
KEYWORD
nonn
AUTHOR
Daniel Suteu, Jul 21 2018
STATUS
approved