371057

Properties

Appears in sequences

• Number of compositions of n with c(1) = 1, c(i+1) - c(i) <= 1, and c(i+1) - c(i) != 0.at n=47A238870
• Reversible primes with k digits, of the form concat(a,b), such that, with all the possible k-1 concatenation of two numbers a and b, we get k-1 primes (a mod b) and the sum of these k-1 primes is a reversible prime itself.at n=14A346559
• Emirps p such that, if q is the next emirp after p, p*q mod (p+q) and floor(p*q/(p+q)) are both emirps.at n=7A350884
• a(n) = Sum_{k=0..floor(n/4)} 2^(n-4*k) * binomial(2*n-6*k+1,2*k+1).at n=12A387696
• Prime numbersat n=31595