534061

Appears in sequences

• Pseudoprimes to bases 2 and 7.at n=28A083733
• Pseudoprimes to bases 2,3 and 7.at n=23A083738
• Composite numbers k such that 2^k-2 and 3^k-3 are both divisible by k and k is not a Carmichael number (A002997).at n=17A153513
• Numbers in A191311 but not in A129521.at n=23A191592
• Poulet numbers (2-pseudoprimes) of the form 7200*n^2 + 8820*n + 2701.at n=6A214016
• Fermat pseudoprimes n to base 3 for which sqrt(8*n + 1) is an integer.at n=30A217841
• Fermat pseudoprimes to base 2 that are triangular.at n=17A293622
• 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=15A306310
• The phi-radical numbers: composite numbers m such that rad(phi(m)) = rad(m-1).at n=17A306478
• Fermat pseudoprimes to base 2 that are hexagonal.at n=16A322130
• Chebyshev pseudoprimes to both base 2 and base 3: composite numbers k such that T(k, 2) == 2 (mod k) and T(k, 3) == 3 (mod k), where T(k, x) is the k-th Chebyshev polynomial of the first kind.at n=22A330208
• Expansion of x^2*(10-5*x+x^2)/((1-x)^4*(1-x^2)).at n=44A331429
• 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=13A339875