1081079

Properties

Appears in sequences

• Primes p such that p+1 is a highly composite number.at n=19A072828
• a(n) is the smallest prime of the form k*lcm(1..n) - 1.at n=12A083685
• a(n) is the smallest prime of the form k*lcm(1..n) - 1.at n=13A083685
• a(n) is the smallest prime of the form k*lcm(1..n) - 1.at n=14A083685
• a(n) = A126098(n) - 1.at n=31A117010
• Numbers k where records occur for d(k+1)/d(k), where d(k) is A000005(k).at n=30A282531
• Primes p for which sigma(p+1)/sigma(p) reaches a record value, where sigma(k) is the divisor sum function (A000203).at n=24A326393
• Numbers k where records occur for sigma(k+1)/sigma(k), where sigma(k) is the sum of divisors of k (A000203).at n=19A335067
• a(n) is the smallest prime p such that tau(p+1) = 2^n.at n=7A343020
• 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=24A362082
• Prime numbersat n=84357