19683001

Appears in sequences

• Carmichael numbers (A002997) k such that k-1 is a perfect power (A001597).at n=4A265328
• Carmichael numbers (A002997) of the form k^3 + 1.at n=3A265628
• Numbers k such that lambda(k)^3 divides (k-1)^2, where lambda(k) = A002322(k).at n=3A277389
• Numbers n > 2 such that A258409(n)*A002322(n) divides n-1.at n=27A284671
• Carmichael numbers k for which A053575(k) [the odd part of phi] divides k-1.at n=18A339869
• Intersection of A137409 and A339870: Composite numbers k of the form 4u+1 having more than one prime factor of type 4u+3, and for which the odd part of phi(k) divides k-1.at n=35A339875
• Carmichael numbers k such that k-1 is a Novak-Carmichael number.at n=25A375322
• Carmichael numbers that are the sum of 2 positive cubes.at n=12A379656