66663

Appears in sequences

• Fibonacci sequence beginning 3, 8.at n=20A022121
• Numbers having four 6's in base 10.at n=27A043516
• Numbers k such that k^5 + 4^k is prime.at n=10A075982
• Numbers k such that k and k^2 use only the digits 3, 4, 5, 6 and 9.at n=8A137123
• a(n)=3*a(n-1)-a(n-2) with a(0)=1, a(1)=3, a(2)=11.at n=11A167375
• Let i be in {1,2,3,4} and let r >= 0 be an integer. Let p = {p_1, p_2, p_3, p_4} = {-2,0,1,2}, n=3*r+p_i, and define a(-2)=1. Then a(n)=a(3*r+p_i) gives the quantity of H_(9,1,0) tiles in a subdivided H_(9,i,r) tile after linear scaling by the factor Q^r, where Q=sqrt(x^2-1) with x=2*cos(Pi/9).at n=44A187499
• Let i be in {1,2,3,4} and let r >= 0 be an integer. Let p = {p_1, p_2, p_3, p_4} = {-2,0,1,2}, n=3*r+p_i, and define a(-2)=0. Then a(n)=a(3*r+p_i) gives the quantity of H_(9,3,0) tiles in a subdivided H_(9,i,r) tile after linear scaling by the factor Q^r, where Q=sqrt(x^2-1) with x=2*cos(Pi/9).at n=41A187501
• Let i be in {1,2,3,4} and let r >= 0 be an integer. Let p = {p_1, p_2, p_3, p_4} = {-2,0,1,2}, n=3*r+p_i, and define a(-2)=0. Then a(n)=a(3*r+p_i) gives the quantity of H_(9,4,0) tiles in a subdivided H_(9,i,r) tile after linear scaling by the factor Q^r, where Q=sqrt(x^2-1) with x=2*cos(Pi/9).at n=40A187502
• Numbers n such that n * (x-1)/x produces a rotation of the digits in n for some value of x.at n=38A288626