166657

Properties

Appears in sequences

• a(n) = (n+3)*a(n-1) + a(n-2), with a(0)=0, a(1)=1.at n=7A058309
• Beastly primes (version 2): primes containing 666 as a substring.at n=28A131645
• The densest possibly infinite sequence of primes of the form a(n) = floor[A^(C^n)] for A < 2. The density parameter C here approaches its minimal possible value C_0 = 1.2209864... (A117739), while the corresponding value of A is 1.8252076... (A243370).at n=14A243358
• a(n) = 2*(K(n,2)*I(4,2) - (-1)^n*I(n,2)*K(4,2)) where I(n,x) and K(n,x) are Bessel functions.at n=11A246662
• Prime numbersat n=15225