282133

Appears in sequences

• Strong pseudoprimes to base 35.at n=32A020261
• Brilliant Sarrus numbers.at n=22A086837
• Nonprime numbers k such that k divides 3^((k+1)/2) - 2^((k+1)/2) - 1.at n=24A130062
• 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=16A153513
• Fermat pseudoprimes to base 2 of the form (n^2 + 2*n)/3.at n=14A216170
• Composite integers k such that 2^k == 2 (mod k*(k+1)).at n=33A217465
• Odd octagonal numbers indexed by triangular numbers.at n=17A243201
• Octagonal numbers (A000567) that are semiprimes (A001358).at n=29A259677
• 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=14A306310
• Fermat pseudoprimes to base 2 that are octagonal.at n=14A321868
• Numbers that are super pseudoprimes to both bases 2 and 3.at n=8A333130