197173

Appears in sequences

• Odd pentagonal pyramidal numbers.at n=18A015223
• a(n) = 1369*n^2 + 37.at n=12A158741
• Six-digit integers that are concatenation and product of three 2-digit primes.at n=10A180467
• Composite numbers m such that tau_k(m) = m for some k, where tau_k is the k-th Piltz divisor function (A077592).at n=20A327774
• a(n) = (3*n - 2)^2*(3*n - 1)/2.at n=24A386906
• a(n) = (8*n + 1)^2*(4*n + 1).at n=9A387684
• Numbers k such that sigma(k) = psi(k) + tau(k) + omega(k)^5.at n=21A391447
• Numbers k such that sigma(k) = psi(k) + tau(k)^2 + omega(k).at n=19A392518