123795

Appears in sequences

• Numbers k such that sigma(k) = sigma(k+3).at n=6A015861
• Duplicate of A049029.at n=16A048897
• Triangle read by rows, the Bell transform of the quartic factorial numbers A007696(n+1) without column 0.at n=16A049029
• Triangle read by rows: T(n,k) is the number of labeled 2-connected planar graphs with n nodes and k edges, n >= 3, n <= k <= 3(n-2).at n=22A100960
• Second column (m=2) of triangle A049029 (S2(5)).at n=4A145562
• Triangle read by rows: expansion of Sum_{k=0..n} binomial(n, k)*(Product_{j=0..n-k+1} (x + i)) * (-1)^k * x^(k-1).at n=44A174789
• Szeged index of the prism graph C_n X P_2 (n >=3).at n=32A245829
• Numbers n such that sigma(n) = m*sigma(n+2) with some m > 1.at n=5A260988
• Values of g-hat_2(n), a sum involving Stirling numbers of the first kind.at n=6A261687