4005001

Appears in sequences

• Poulet numbers (2-pseudoprimes) of the form 144*n^2 + 222*n + 85.at n=24A214017
• 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=21A339875