2403763488

Appears in sequences

• Denominators of continued fraction convergents to sqrt(5).at n=16A001076
• Expansion of x*(1 + x - 2*x^2) / ( 1 - 4*x^2 - x^4).at n=32A059973
• a(0) = 0, a(1) = 4, then a(n) = 18*a(n-1) - a(n-2).at n=8A060645
• Nonprimes which are the average of two consecutive Fibonacci numbers.at n=14A071683
• Consider the mapping f(r) = (1/2)*(r + N/r) from rationals to rationals where N = 5. Starting with a = 2 and applying the mapping to each new (reduced) rational number gives 2, 9/4, 161/72, 51841/23184, ..., tending to N^(1/2). Sequence gives values of the denominators.at n=4A081460
• Ratio-determined insertion sequence I(0.264) (see the link below).at n=15A085348
• Smallest integer divisible by Fibonacci(2n) such that the second partial quotient in the continued fraction expansion of a(n)/phi is 2 (phi is the golden ratio), n >= 2.at n=10A088166
• Negative of the Hankel transform of C(n) - C(n+2), where C = A000108.at n=22A138268
• p-INVERT of the positive integers, where p(S) = 1 - S^2.at n=23A290890
• Expansion of (1 - x + x^2)/((1 - x + x^2)^2 - 4*x^2).at n=23A376716
• Lower (1/2)-midsequence of (F(2n)) and (F(2n+1)), where F=A000045 (Fibonacci numbers); see Comments.at n=23A387778
• Upper (1/2)-midsequence of (F(2n)) and (F(2n+1)), where F=A000045 (Fibonacci numbers); see Comments.at n=23A387779