78131

Appears in sequences

• a(n) = C(n,5) + C(n,4) - C(n,3) + 1, n >= 7.at n=20A005288
• Numerator of Sum_{k=1..n} 1/phi(k).at n=37A028415
• Sums of 3 distinct powers of 5.at n=35A038475
• Number of reduced words of length n in the Weyl group A_23.at n=5A161523
• Square array A(n,k), n >= 1, k >= 0, read by antidiagonals: A(n,k) = Sum_{d|n} d*sigma_k(d).at n=59A322104