2205967

Appears in sequences

• Sarrus numbers k such that k-1 and k+1 have the same number of prime divisors (counted with multiplicity).at n=19A086806
• Poulet numbers (2-pseudoprimes) of the form 144*n^2 + 222*n + 85.at n=19A214017
• Composite numbers k == 3 (mod 4) such that (1 + i)^k == 1 - i (mod k), where i = sqrt(-1).at n=18A270697
• Fermat pseudoprimes to base 2 that are decagonal.at n=31A321870
• Base-2 Fermat pseudoprimes k such that the multiplicative order of 2 modulo k is odd.at n=18A367230