1441439

Properties

Appears in sequences

• Primes p such that p+1 is a highly composite number.at n=20A072828
• a(n) is the smallest prime of the form k*lcm(1..n) - 1.at n=15A083685
• a(n) = A126098(n) - 1.at n=32A117010
• Primes of the form colossally abundant number - 1.at n=6A136669
• Numbers k where records occur for d(k+1)/d(k), where d(k) is A000005(k).at n=31A282531
• Primes p for which sigma(p+1)/sigma(p) reaches a record value, where sigma(k) is the divisor sum function (A000203).at n=25A326393
• Numbers k where records occur for sigma(k+1)/sigma(k), where sigma(k) is the sum of divisors of k (A000203).at n=20A335067
• 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=25A362083
• Prime numbersat n=110030