81722145

Appears in sequences

• Pseudoprimes (base-2) equal to the product of 6 primes not necessarily distinct.at n=2A112444
• Fermat pseudoprimes to base 2 divisible by 15.at n=29A216364
• Poulet numbers (Fermat pseudoprimes to base 2) k that have an abundancy index sigma(k)/k that is larger than the abundancy index of all smaller Poulet numbers.at n=6A328691