30666137

Appears in sequences

• Odd integers n such that for every integer k>0, n*2^k+1 has a divisor in the set { 3, 5, 7, 13, 19, 37, 109 }.at n=22A244563
• Odd numbers that are neither of the form p + 2^k nor of the form p - 2^k with k > 0, and p prime.at n=0A263644
• a(n) = (conjectured) smallest positive integer k which is neither of the form p + n^x nor of the form p - n^x with x >= 0 and p prime, where gcd(k, n) = 1 and gcd(k^2-1, n-1) = 1.at n=0A283619