31117

Appears in sequences

• a(n) = (5*n + 1)^2 + 4*n + 1.at n=35A007533
• Polynomial (1/3)*n^3 + (9/2)*n^2 + (85/6)*n - 2.at n=41A073775
• Sum of the digits of 5^(10^n).at n=4A124306
• Maximal non-semiprime number which is a "preprime" of the n-th kind (defined in comment in A247395).at n=30A247834
• Greatest positive integer whose weakly increasing prime indices have zero-based weighted sum (A359674) equal to n.at n=33A359757
• Composite numbers for which A324644(n)/A324198(n) = 2 and sigma(n) == 2 (mod 4).at n=26A371082
• a(n) is the number of closed binary operations on n elements, labeled, that satisfy both x(yz) = (xy)z and x(yz) = xz identically.at n=7A389829
• Numbers k such that sigma(k) = psi(k) + tau(k) + omega(k)^5.at n=11A391447
• Numbers k such that sigma(k) = psi(k) + tau(k)^2 + omega(k).at n=9A392518