332641

Properties

Appears in sequences

• Numbers k > 1 such that sigma(phi(k))/sigma(k) > sigma(phi(j))/sigma(j) for all 1 < j < k.at n=24A067573
• Primes p such that p-1 is a highly composite number.at n=16A072826
• Smallest prime of the form 1+n*(n+n_2)*...*(n+n_n) with 1<=n_2<n_3<...<n_n. A089308 gives terms of products.at n=5A089307
• 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=41A090481
• Primes p such that p-1 has more divisors than any smaller prime-1.at n=27A103199
• Highly composite numbers + 1.at n=33A135372
• a(n) = n-th prime arising A144717.at n=7A144718
• Primes arising in A144724.at n=6A144725
• Primes p such that p = 1 + 27720*k for some k.at n=2A217692
• Numbers k such that sigma(phi(k))/k > sigma(phi(m))/m for all m < k, where sigma is the sum of divisors function (A000203) and phi is Euler's totient function (A000010).at n=26A293059
• Prime numbersat n=28615