1690501

Appears in sequences

• Lucas pseudoprimes whose reversal is prime.at n=12A164824
• Composite numbers k such that k divides Fibonacci(k+1) or Fibonacci(k-1) and 2^(k-1) == 1 (mod k).at n=20A214434
• Fermat pseudoprimes to base 2 of the form (n^2 + 2*n)/3.at n=31A216170
• Sarrus numbers (A001567) that are the average of two consecutive primes.at n=19A265684
• Fermat pseudoprimes to base 2 that are octagonal.at n=31A321868
• Numbers that are both Fermat pseudoprimes to base 2 (A001567) and Bruckman-Lucas pseudoprimes (A005845).at n=12A329240
• Numbers that are super pseudoprimes to both bases 2 and 3.at n=17A333130