20496

Appears in sequences

• Expansion of 1/((1-2x)*(1-4x)*(1-10x)).at n=4A016292
• Number of partitions satisfying (cn(0,5) <= cn(2,5) = cn(3,5) and cn(0,5) <= cn(1,5) and cn(0,5) <= cn(4,5)).at n=52A036807
• Numbers which contain exactly the same digits (with the correct multiplicity) in 3 different smaller bases.at n=33A059828
• Output of the linear congruential pseudo-random number generator used in function rand() as described in Kernighan and Ritchie, when seeded with 0.at n=20A096554
• Coefficients in a q-analog of the LambertW function, as a triangle read by rows.at n=48A152290
• Numbers n such that n^6 + 545 is prime.at n=10A163592
• Number of 3-step left-handed knight's tours (moves only out two, left one) on an n X n board summed over all starting positions.at n=43A187173
• Numbers n such that Sum_{i = 1..q} 1/d(i) is an integer where d(i) are the divisors of n for some q and n is primitive (the set {d(1), d(2), ..., d(q)} appears only once).at n=11A226853
• Number of distinct lines passing through at least two points in a triangular grid of side n.at n=22A244504
• Number of (n+2) X (2+2) 0..3 arrays with every 3 X 3 subblock row and column sum equal to 0 2 3 6 or 7 and every 3 X 3 diagonal and antidiagonal sum not equal to 0 2 3 6 or 7.at n=13A252108
• Numbers containing only 1's and 0's in their base-2, base-3, and base-4 representations.at n=15A258981
• n such that 3 < sigma(n)/n < sigma(m)/m for all abundant numbers m<n such that 3 < sigma(m)/m.at n=6A259312
• Expansion of e.g.f. exp(x^3 * (exp(x) - 1)).at n=8A292891
• Square array T(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of e.g.f. exp(x^k * (exp(x) - 1)).at n=74A292892
• Numbers k such that (26*10^k - 503)/9 is prime.at n=16A296051
• 3-admirable numbers: 3-abundant numbers (A068403) k such that exists a proper divisor d of k such that sigma(k) - 2*d = 3*k, where sigma(k) is the sum of divisors of k (A000203).at n=40A329189
• a(n) = A193737(2*n, n).at n=7A330793
• Nonprime numbers k such that A054008(k) = A054024(k).at n=13A343242
• Expansion of Sum_{k>=0} x^(2*k) / (1 - k*x)^(k+1).at n=11A360814
• 3-abundant numbers k such that k/(sigma(k)-3*k) is an integer.at n=36A364976