55561

Appears in sequences

• Numbers k such that k, k+2, k+4, k+6, k+8, k+10 are semiprimes.at n=23A092128
• Least semiprime whose prime factors differ by n!.at n=6A190801
• G.f.: Product_{n>=1} [ (1 - 2^n*x^n) / (1 - (n+2)^n*x^n) ]^(1/n).at n=6A205814