41976

Appears in sequences

• The differences 1-1, 21-12, 321-123, ..., 10987654321-12345678910, 1110987654321-1234567891011, etc.at n=4A019566
• Susceptibility series H_4 for 2-dimensional Ising model (divided by 2).at n=11A055856
• Numbers that have exactly seven prime factors counted with multiplicity (A046308) whose digit reversal is different and also has 7 prime factors (with multiplicity).at n=28A109027
• a(n) = (n^4 + 46*n^3 - 169*n^2 + 146*n + 24)/24.at n=23A143059
• A recursive triangular sequence with row sums (5^(n - 1)*(n + 3)!)/12: A(n,k)= A(n - 1, k - 1) + A(n - 1, k) + 5 *(2 + n) (13 + 5* n)*A(n - 2, k - 1).at n=29A153811
• A recursive triangular sequence with row sums (5^(n - 1)*(n + 3)!)/12: A(n,k)= A(n - 1, k - 1) + A(n - 1, k) + 5 *(2 + n) (13 + 5* n)*A(n - 2, k - 1).at n=34A153811
• Number of binary strings of length n with no substrings equal to 0001 0111 or 1100.at n=19A164484
• Composite numbers such that sum_{i=1..k} (p_i/(p_i+1))/product_{i=1..k} (p_i/(p_i+1)) is an integer, where p_i are the k prime factors of n (with multiplicity).at n=28A227248
• a(n) = Sum_{i=0..n-1} i*10^i - Sum_{i=0..n-1} (n-1-i)*10^i.at n=4A338226