166319

Properties

Appears in sequences

• Numbers whose least quadratic nonresidue (A020649) is 23.at n=22A025028
• Primes p such that p+1 is a highly composite number.at n=17A072828
• Primes p such that tau(p-1)+tau(p+1) is larger than for any previous term. (Smallest prime sandwiched between more composite numbers.)at n=37A090481
• Odd numbers k for which 23 is the smallest positive i with Jacobi symbol J(i,k) != 1.at n=32A112079
• Primes of the form k^3 - k - 1.at n=21A116581
• a(n) is the smallest prime such that exactly n prime pairs (p,q) exist with a(n) = p * q + p + q.at n=16A198277
• Second smallest number of complexity n: second smallest number requiring n 1's to build using + and *.at n=35A265360
• Numbers k where records occur for d(k+1)/d(k), where d(k) is A000005(k).at n=24A282531
• Primes p for which sigma(p+1)/sigma(p) reaches a record value, where sigma(k) is the divisor sum function (A000203).at n=21A326393
• Numbers k where records occur for sigma(k+1)/sigma(k), where sigma(k) is the sum of divisors of k (A000203).at n=15A335067
• a(n) is the least k such that there are exactly n numbers i with A075254(i) = k.at n=17A346378
• Numbers k achieving record deficiency via a residue-based measure, M(k) = (k+1)*(1 - zeta(2)/2) - 1 - ( Sum_{j=1..k} k mod j )/k.at n=20A362082
• Numbers k such that, via a residue based measure M(k) (see Comments), k is deficient, k+1 is abundant, and abs(M(k)) + abs(M(k+1)) reaches a new maximum.at n=19A362083
• Prime numbersat n=15198