67861

Appears in sequences

• Bruckman-Lucas pseudoprimes: k | (L_k - 1), where k is composite and L_k = Lucas numbers A000032.at n=18A005845
• Strong pseudoprimes to base 12.at n=29A020238
• Strong pseudoprimes to base 86.at n=18A020312
• Composite n coprime to 5 such that Fibonacci(n) == Legendre(n,5) (mod n).at n=21A049062
• Primitive part of Lucas(n).at n=38A061447
• Composite numbers k such that k divides F(k-1) where F(j) are the Fibonacci numbers.at n=19A069106
• Sequence arising from factorization of the Fibonacci numbers.at n=38A072183
• Composite k such that Fibonacci(k) == Legendre(k,5) == 1 (mod k).at n=15A093372
• Odd composites m that divide Fibonacci(m)-1.at n=26A094394
• Composite n such that n divides both Fibonacci(n-1) and Fibonacci(n) - 1.at n=9A094401
• Semiprimes k that divide Fibonacci(k-1).at n=10A177086
• Frobenius pseudoprimes with respect to Fibonacci polynomial x^2 - x - 1.at n=10A212424
• Nonprime n not divisible by 2 or 3 such that Fibonacci(n-1) is congruent to (1 - Legendre(n,5))/2 modulo n.at n=24A220292
• Expansion of x^2*(1+x^2) / ( (x^2-x+1)*(-x^2-x+1)*(1+x+x^2) ).at n=26A227047
• Indices of hexagonal numbers (A000384) that are also centered pentagonal numbers (A005891).at n=8A254962
• Frobenius pseudoprimes == 1,4 (mod 5) with respect to Fibonacci polynomial x^2 - x - 1.at n=8A319168
• Odd composite integers m such that F(m)^2 == 1 (mod m) and L(m) == 1 (mod m), where F(m) and L(m) are the m-th Fibonacci and Lucas numbers, respectively.at n=12A337625
• Expansion of 1/sqrt((1 - x^3 - x^5)^2 - 4*x^8).at n=40A376784