98556

Appears in sequences

• a(1)=1. a(n+1) = sum a(k), where the sum is over all positive integers k, k <= n, where each positive integer <= k and coprime to k is also coprime to n.at n=23A124693
• a(n) = 4*n*(n^2 - 3*n - 1)/3.at n=43A275876
• Least number x such that x^n has n digits equal to k. Case k=5.at n=35A285452
• Number of endless self-avoiding walks of length 2*n for the honeycomb lattice.at n=9A334330
• a(n) = (2*n^3 - 6*n^2 + 19*n - 9)*n/6.at n=23A378023