37981
domain: N
Appears in sequences
- Composite numbers whose prime factors contain no digits other than 1 and 9.at n=23A036309
- a(n) = (2*n - 1)*(24*n^2 - 42*n + 19).at n=9A160174
- The function W_n(6) (see Borwein et al. reference for definition).at n=18A169711
- Number of -n..n arrays of 4 elements with adjacent element differences also in -n..n.at n=7A201043
- Number of n X 2 zero-sum -1..1 arrays with rows and columns lexicographically nondecreasing.at n=15A202027
- Squarefree k > 1 with sigma(sigma(sigma(k))) < 3*k + 1.at n=40A320513
- Expansion of Product_{1 <= i < j} 1/(1 - x^(i*j)).at n=43A321285
- a(n) = Sum_{k=0..floor(n/4)} 2^k * binomial(n-3*k,k)^2.at n=17A387508