211007

Properties

Appears in sequences

• Primes prime(k) such that 2^k - prime(k) is also prime.at n=18A078686
• Primes of the form (1+2n+3n^2+4n^3)/2.at n=9A123077
• a(n) is the least number such that d(a(n)) = d(R(a(n)))/n, where R(n) is the digit reverse of n and d(n) is the number of divisors of n.at n=29A284495
• Prime numbersat n=18892