68251

Appears in sequences

• Bruckman-Lucas pseudoprimes: k | (L_k - 1), where k is composite and L_k = Lucas numbers A000032.at n=19A005845
• Strong pseudoprimes to base 20.at n=21A020246
• Strong pseudoprimes to base 25.at n=35A020251
• Strong pseudoprimes to base 26.at n=20A020252
• Strong pseudoprimes to base 31.at n=15A020257
• Strong pseudoprimes to base 37.at n=22A020263
• Strong pseudoprimes to base 51.at n=30A020277
• Strong pseudoprimes to base 53.at n=23A020279
• Strong pseudoprimes to base 57.at n=33A020283
• Strong pseudoprimes to base 71.at n=24A020297
• Strong pseudoprimes to base 72.at n=29A020298
• Strong pseudoprimes to base 84.at n=19A020310
• Strong pseudoprimes to base 88.at n=23A020314
• Strong pseudoprimes to base 90.at n=21A020316
• Strong pseudoprimes to base 98.at n=32A020324
• Composite n coprime to 5 such that Fibonacci(n) == Legendre(n,5) (mod n).at n=22A049062
• Composite numbers k such that k divides F(k-1) where F(j) are the Fibonacci numbers.at n=21A069106
• Composite k such that Fibonacci(k) == Legendre(k,5) == 1 (mod k).at n=16A093372
• Odd composites m that divide Fibonacci(m)-1.at n=27A094394
• Composite n such that n divides both Fibonacci(n-1) and Fibonacci(n) - 1.at n=10A094401