22644

Appears in sequences

• a(n) = (7*n+1)*(7*n+6).at n=21A001526
• Number of n-step walks on square lattice in the first quadrant which finish at distance n-3 from the x-axis.at n=33A005564
• a(n) = prime(n)^2 - prime(n+1).at n=35A062235
• a(n) = A000203(n)^2 - A001157(n) - 2n = sigma(n)^2 - sigma_2(n) - 2n.at n=59A066294
• a(n) = floor(6^n/5^n).at n=55A094983
• Numbers k such that the digits of sigma(k) are a permutation of those of k, in base 10.at n=23A115920
• a(n) = 17*n*(n+1).at n=36A173308
• Numbers n such that gcd(n, phi(n)) = gcd(phi(n), sigma(n)) = gcd(sigma(n), n) = tau(n).at n=39A217301
• Number of subsets of {1,...,n} containing n and having at least one set partition into 9 blocks with equal element sum.at n=9A248118
• Numbers that divide the sum of the reverse of their aliquot parts (A069250).at n=7A254009
• Number of length n arrays of permutations of 0..n-1 with each element moved by -3 to 3 places and every three consecutive elements having its maximum within 4 of its minimum.at n=13A263698
• Expansion of Product_{k>=0} (1 + x^(3^k))^(3^(k+1)).at n=24A321354
• Perimeters of nondegenerate triangles with integer areas, whose side lengths are triangular numbers.at n=42A385737