6486479

Properties

Appears in sequences

• Primes p such that p+1 is a highly composite number.at n=21A072828
• Primes of the form 16*k-1 such that 4*k-1, 8*k-1, 32*k-1 and 64*k-1 are also primes.at n=13A101997
• Primes p such that 2*p + 1 is also prime and p + 1 is a highly composite number (definition 1).at n=11A214873
• Numbers k where records occur for d(k+1)/d(k), where d(k) is A000005(k).at n=36A282531
• Primes p for which sigma(p+1)/sigma(p) reaches a record value, where sigma(k) is the divisor sum function (A000203).at n=27A326393
• Primes p that are simultaneously of the forms 2*q+1, 4*r+3, 6*s+5 and 8*t+7 where q,r,s,t are primes.at n=24A328799
• Prime numbersat n=443899