587861

Appears in sequences

• Pseudoprimes to bases 2 and 7.at n=31A083733
• Pseudoprimes whose prime factors do not divide any smaller pseudoprime.at n=17A084653
• Sarrus numbers that become prime when two is added.at n=19A137198
• Fermat pseudoprimes to base 2 of the form (n^2 + 2*n)/3.at n=17A216170
• Pseudoprimes to a twin prime criterion of Aebi and Cairns.at n=20A224695
• 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=16A306310
• Fermat pseudoprimes to base 2 that are octagonal.at n=17A321868
• a(n) = Sum_{k=0..floor(n/3)} binomial(n+k,k) * binomial(n-2*k,k).at n=16A383528