55421

Appears in sequences

• Crystal ball sequence for diamond.at n=40A007904
• Composite numbers which in base 8 contain their largest proper factor as a substring.at n=8A063167
• Duplicate of A063167.at n=8A063878
• Second-order Lucas numbers; a(n) = (2n+3)*Lucas(n) - n*Lucas(n-1).at n=16A134410
• Expansion of (1/(1 - x)) * Product_{k>=1} (1 + k*x^k/(1 - x)^k).at n=11A307259