18407
domain: N
Appears in sequences
- Coordination sequence for sigma-CrFe, Position Xa.at n=34A009962
- Numbers whose base-7 representation contains exactly four 4's.at n=30A043412
- Composite numbers k that divide Fibonacci(k+1).at n=8A069107
- Odd Fibonacci pseudoprimes: odd composite numbers k such that either (1) k divides Fibonacci(k-1) if k == +-1 (mod 5) or (2) k divides Fibonacci(k+1) if k == +-2 (mod 5).at n=16A081264
- Odd composites m that divide Fibonacci(m)-1.at n=9A094394
- Numbers k that divide Lucas(k) + 1.at n=33A094398
- Odd numbers k that divide Lucas(k) + 1.at n=11A094399
- Numbers k that divide both Fibonacci(k+1) and Lucas(k) + 1.at n=5A094402
- Odd numbers k that divide Fibonacci(k) - 1 but not Fibonacci(k-1).at n=4A094409
- Numbers k that divide Fibonacci(k+1) but do not divide Fibonacci(k) + 1.at n=6A094412
- Semiprimes n such that 3*n + 4 is a square.at n=25A112666
- Numbers k which divide the sum of the Fibonacci numbers F(1) through F(k) and such that k is not a multiple of 24.at n=20A124456
- Semiprimes k that divide Fibonacci(k+1).at n=6A177745
- a(n) = (2*n+1)*(6*n-1).at n=39A179741
- Composite numbers k that divide both Fibonacci(k+1) and Fibonacci(2k+1)-1.at n=7A182504
- Composite numbers k that divide Fibonacci(k+1) or Fibonacci(k-1).at n=20A182554
- Lucas pseudoprimes.at n=16A217120
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 621", based on the 5-celled von Neumann neighborhood.at n=24A273268
- Numbers k such that Fibonacci(k) == +-1 (mod k) and k is neither 1 nor prime nor twice a prime.at n=25A279072
- Number of nonagons that can be formed with perimeter n.at n=43A288255