722261
domain: N
Appears in sequences
- Pseudoprimes whose prime factors do not divide any smaller pseudoprime.at n=22A084653
- Pseudoquadprimes: p+4 for primes p where p+4 divides p^(p+4) + 4 and p+4 is composite.at n=35A100875
- Composite numbers k such that k divides Fibonacci(k+1) or Fibonacci(k-1) and 2^(k-1) == 1 (mod k).at n=11A214434
- Fermat pseudoprimes to base 2 of the form (n^2 + 2*n)/3.at n=20A216170
- Odd numbers k > 1 such that 2^((k-1)/2) == -(2/k) = -A091337(k) (mod k), where (2/k) is the Jacobi (or Kronecker) symbol.at n=23A306310
- Fermat pseudoprimes to base 2 that are octagonal.at n=20A321868
- Numbers that are both Fermat pseudoprimes to base 2 (A001567) and Bruckman-Lucas pseudoprimes (A005845).at n=6A329240