327739

Properties

Appears in sequences

• (Provable) Sierpiński numbers: odd numbers n such that for all k >= 1 the numbers n*2^k + 1 are composite.at n=4A076336
• Prime values of n for which n*2^k + 1 is composite for all positive integers k.at n=2A137715
• 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, 97, 257 }.at n=0A244566
• Odd numbers n not congruent to 5 mod 6 such that for all k >= 1 the numbers n*4^k + 1 are composite.at n=3A251057
• 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=23A257647
• Prime numbersat n=28228