741751

Appears in sequences

• Pseudoprimes whose prime factors do not divide any smaller pseudoprime.at n=23A084653
• Pseudoprimes to base 2 of the form 4k+3.at n=28A177884
• Poulet numbers (2-pseudoprimes) of the form 144*n^2 + 222*n + 85.at n=14A214017
• Composite numbers k such that k divides Fibonacci(k+1) or Fibonacci(k-1) and 2^(k-1) == 1 (mod k).at n=12A214434
• Numbers of the form 4k+3 (A004767) that are Lucas pseudoprimes and Fermat pseudoprimes to base 2 (intersection of A005845 and A001567).at n=0A227905
• Sarrus numbers (A001567) that are the average of two consecutive primes.at n=13A265684
• Composite numbers k == 3 (mod 4) such that (1 + i)^k == 1 - i (mod k), where i = sqrt(-1).at n=7A270697
• Fermat pseudoprimes to base 2 that are decagonal.at n=18A321870
• a(n) is the smallest Fermat pseudoprime to base 2 such that gpf(p-1) = prime(n) for all prime factors p of a(n).at n=13A327789
• Numbers that are both Fermat pseudoprimes to base 2 (A001567) and Bruckman-Lucas pseudoprimes (A005845).at n=7A329240
• Base-2 Fermat pseudoprimes k such that the multiplicative order of 2 modulo k is odd.at n=12A367230