755681

Properties

Appears in sequences

• a(0) = 1; a(n) = Sum_{0 <= k < n and gcd(k,n) = 1} a(k).at n=25A045545
• Primes that become squares when prefixed with an 8.at n=23A167741
• Number of meta-Sylvester classes of 2-multiparking functions of length n.at n=7A243696
• Triangle T, read by rows, where T(n,k) = Sum_{j=1..n-k-1} [T^j](n-1,k) with T(n+1,n) = 2*n+1 and T(n,n)=0 for n>=0, where T^j denotes the j-th matrix power of T.at n=36A243920
• Prime numbersat n=60668