login
Carmichael numbers equal to the product of 7 primes.
9

%I #12 Jun 25 2019 10:44:40

%S 5394826801,6295936465,12452890681,13577445505,15182481601,

%T 20064165121,22541365441,24673060945,26242929505,26602340401,

%U 27405110161,28553256865,33203881585,38059298641,39696166081,40460634865

%N Carmichael numbers equal to the product of 7 primes.

%H Amiram Eldar, <a href="/A112430/b112430.txt">Table of n, a(n) for n = 1..10000</a>

%e a(1) = 5394826801 = 7*13*17*23*31*67*73.

%o (PARI) is(n)={bigomega(n)==7&&is_A002997(n)} \\ _M. F. Hasler_, Apr 14 2015

%Y Cf. A002997, A087788, A141711, A074379, A112428, A112429, A112431, A112432, A006931.

%K easy,nonn

%O 1,1

%A _Shyam Sunder Gupta_, Dec 11 2005