20740
domain: N
Appears in sequences
- Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 72.at n=3A031750
- Multiplicity of highest weight (or singular) vectors associated with character chi_104 of Monster module.at n=40A034492
- Numbers whose base-4 representation contains exactly four 0's and four 1's.at n=27A045037
- a(n) = n^4+4 = (n^2-2*n+2)*(n^2+2*n+2) = ((n-1)^2+1)*((n+1)^2+1).at n=12A057781
- Expansion of (5 - 9*x + 6*x^2)/(1-x)^4.at n=39A080957
- a(n) = A000695(A014486(n)).at n=16A083931
- Increasing partial quotients in the continued fraction expansion of the prime constant (A051006).at n=12A102878
- Numbers k such that k^3 divides 3^(k^2) - 1.at n=40A129211
- a(n) = 16*n^2 + 4.at n=35A158444
- a(n) = 2*n*(9*n-1).at n=33A178574
- Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,2,0,1,4 for x=0,1,2,3,4.at n=8A196584
- T(n,k)=Number of nXk 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,2,0,1,4 for x=0,1,2,3,4.at n=46A196590
- T(n,k)=Number of nXk 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,2,0,4,1 for x=0,1,2,3,4.at n=46A196802
- T(n,k)=Number of nXk 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,2,0,1,3 for x=0,1,2,3,4.at n=46A197047
- The number of meandering curves of order n, with only one extremity covered by its arcs.at n=10A217310
- a(n) = 16*n^4 + 4.at n=6A222655
- For every positive integer m, let u(m) = (d(1),d(2),...,d(k)) be the unitary divisors of m. The sequence (a(n)) consists of integers of the form d(k)/d(1) + d(k-1)/d(2) + ... + d(k)/d(1).at n=13A229999
- Triangle read by rows: T(m,n) is the Szeged index of the grid graph P_m X P_n (1 <= n <= m).at n=32A245826
- Numbers containing only 1's and 0's in their base-2, base-3, and base-4 representations.at n=19A258981
- a(n) = F(n)^2 + 4*(-1)^n = F(n+3)*F(n-3), where F = A000045.at n=12A292612