509203

Properties

Appears in sequences

• Riesel numbers: odd numbers n such that for all k >= 1 the numbers n*2^k - 1 are composite.at n=0A076337
• Riesel numbers n (n*2^k-1 is composite for all k>0, n odd) that have a covering set.at n=0A101036
• Prime Riesel numbers: primes p such that p*2^k - 1 is composite for all positive integers k.at n=0A182296
• Least k such that k*2^m - 1 has a covering set with precisely n primes.at n=0A206430
• Odd integers n such that for every integer k>0, n*2^k-1 has a divisor in the set {3, 5, 7, 13, 17, 241}.at n=0A244070
• Least k such that k*2^m - 1 has a covering set of modulus 2*n, or 0 if no such value exists.at n=11A258154
• Prime Riesel numbers p that are not Mersenne primes such that 2*p is a noncototient.at n=0A263958
• Smallest Riesel number to base n.at n=0A273987
• Prime numbersat n=42228