197209

Appears in sequences

• Strong pseudoprimes to base 24.at n=34A020250
• Strong pseudoprimes to base 31.at n=25A020257
• Strong pseudoprimes to base 33.at n=30A020259
• Strong pseudoprimes to base 61.at n=32A020287
• Semiprimes whose prime factors are distinct and the reversal of one factor is equal to the other.at n=10A083815
• Nonprimes n such that Mod(n,4) == 1 and denominator(Fibonacci((n-1)/4)/n) = 1.at n=12A091982
• Composite k such that Fibonacci(k) == Legendre(k,5) == 1 (mod k).at n=31A093372
• Composite n such that n divides both Fibonacci(n-1) and Fibonacci(n) - 1.at n=20A094401
• Least j > 1 such that j^2 = (4*n^2 + 2)*(k^2) + (4*n^2 + 2)*k + 1.at n=36A106231
• Semiprimes k that divide Fibonacci(k-1).at n=24A177086
• Frobenius pseudoprimes with respect to Fibonacci polynomial x^2 - x - 1.at n=24A212424
• Frobenius pseudoprimes == 1,4 (mod 5) with respect to Fibonacci polynomial x^2 - x - 1.at n=17A319168
• 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=30A337625
• a(n) is the least k such that 3^k begins with n!.at n=8A374922
• Semiprimes whose prime factors are the digit reversal of each other.at n=24A376746
• Semiprime 12-gonal numbers.at n=12A380069