64821

Appears in sequences

• Pseudoquadprimes: p+4 for primes p where p+4 divides p^(p+4) + 4 and p+4 is composite.at n=13A100875
• Numbers k such that 6*3^k + 1 is prime.at n=30A216888
• a(n) = cpg(3, n) * cpg(4, n) * ... * cpg(n, n) where cpg(m, n) is the n-th m-th-order centered polygonal number.at n=5A257133