28812

Appears in sequences

• Number of alternating sign n X n matrices invariant under a quarter turn.at n=12A005160
• Multiply by 1, add 1, multiply by 2, add 2, etc.; start with 3.at n=13A019466
• Expansion of 1/(1-7*x)^7.at n=3A036226
• Numbers n such that A048767(n) = n.at n=30A048768
• Erroneous version of A005160.at n=12A059740
• Numbers k > 1 such that, in base 6, k and k^2 contain the same digits in the same proportion.at n=14A061660
• Numbers k such that sopf(k) = d(k) where d(k) = A001223(k) and sopf(k) = A008472(k).at n=39A064010
• 7th binomial transform of (1,1,0,0,0,0,...).at n=5A081107
• Smallest k such that k and k+n have the same prime signature that is different from all previous terms.at n=23A085876
• Triangle, read by rows, of coefficients for the second iteration of the hyperbinomial transform.at n=22A089460
• Secondary diagonal of array A089944, in which the n-th row is the n-th binomial transform of the natural numbers.at n=5A089946
• Triangle, read by rows: T(0,0) = 1; T(n,k) = n!*T(n-1,k) - T(n-1,k-1).at n=17A107415
• Numbers of the form (7^i)*(12^j), with i, j >= 0.at n=16A108238
• Primal codes of finite permutations on positive integers.at n=37A109297
• Triangle read by rows: G(s, rho) = ((s-1)!/s)*Sum_{i=0..s-1} ((s-i)/i!)*(s*rho)^i.at n=26A122525
• a(n) = n*(n-1)*7^n.at n=3A128801
• a(n) = ((n-th prime)^6-(n-th prime)^4)/4.at n=3A138455
• Integer averages of the first perfect cubes up to some n^3.at n=35A164577
• Rectangular array T(n,k) = binomial(n,2)*k*n^(k-1) read by antidiagonals.at n=41A178756
• Numbers k such that the sum of prime factors of k (counted with multiplicity) equals five times the largest prime divisor of k.at n=17A212863