40182

Appears in sequences

• a(n) = n*(n+1)*(5*n+1)/6.at n=35A033994
• Numbers equal to a permutation (or rearrangement) of the digits of the sum of their proper divisors. Rearrangements which cause leading zeros are excluded.at n=37A085844
• Number of n X 6 0..2 arrays with rows, diagonals and antidiagonals unimodal and columns nondecreasing.at n=2A224260
• T(n,k) = number of n X k 0..2 arrays with rows, diagonals and antidiagonals unimodal and columns nondecreasing.at n=30A224262
• Number of 3 X n 0..2 arrays with rows, diagonals and antidiagonals unimodal and columns nondecreasing.at n=5A224263
• a(n) is the least integer k such that there are n values of i <= k for which gpf(i^2 + 1) = gpf(k^2 + 1), where gpf(x) is the greatest prime factor of x.at n=35A258840
• T(n,e) is the number of unlabeled posets of n>=0 points with e>=0 arcs in the Hasse diagram, irregular triangle read by rows.at n=69A342447