39605
domain: N
Appears in sequences
- a(n) = a(n-1) + a(n-2) - 2, a(0) = 4, a(1) = 3.at n=22A000211
- Numerators of continued fraction convergents to sqrt(489).at n=9A041932
- Expansion of (1 - x + 3*x^3 - 2*x^4 - 3*x^5)/(1 - 2*x + x^3).at n=22A048162
- Composite numbers k such that sigma(k) / d(k) is prime.at n=27A048969
- Numbers k such that 60*R_k + 7 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=29A056657
- a(n) = Lucas(n) + (-1)^n + 1.at n=21A068397
- a(n) = Lucas(4n+2)+2, or 5*Fibonacci(2n+1)^2.at n=5A081067
- a(n) = Fibonacci(2*n+1) + Fibonacci(2*n-1) + 2.at n=11A092387
- a(n) = 5*Fibonacci(n)^2.at n=10A099921
- Duplicate of A068397.at n=21A102081
- Inverse Moebius transform of Lucas numbers (A000032).at n=22A108031
- The first 10 digits of the cube root of n contain the digits 0-9.at n=10A119517
- Number of (n+1)X(n+1) -7..7 symmetric matrices with every 2X2 subblock having sum zero and one, two or three distinct values.at n=7A211445
- Beach-Williams Pell numbers of type k^2 + 4.at n=10A212083
- Let L(n) = Fibonacci(n-1)+Fibonacci(n+1) (cf. A000045, A000032); if n is even then a(n) = (L(n)+2)^2 otherwise a(n) = L(2*n)+2.at n=11A233000
- Duplicate of A092387.at n=11A240926
- The numerator of curvature of touching circles inscribed in a special way in the smaller segment of circle of radius 1/6 divided by a chord of length sqrt(8/75).at n=4A248834
- Numbers p^2*q, p > q odd primes such that q divides p+1.at n=23A350245
- Numbers k such that sigma(k) = psi(k) + tau(k).at n=43A387953