12972959

Properties

Appears in sequences

• Primes of the form 32*k-1 such that 4*k-1, 8*k-1, 16*k-1 and 64*k-1 are also primes.at n=13A101998
• Primes p for which sigma(p+1)/sigma(p) reaches a record value, where sigma(k) is the divisor sum function (A000203).at n=28A326393
• Numbers k where records occur for sigma(k+1)/sigma(k), where sigma(k) is the sum of divisors of k (A000203).at n=24A335067
• a(n) = (n-1)! * Sum_{d|n} (-1)^(d+1) / (d-1)!.at n=11A363736
• Prime numbersat n=847600