41800

Appears in sequences

• Infinitary sociable numbers (smallest member of cycle).at n=4A004607
• Coordination sequence for 4-dimensional cubic lattice (points on surface of 4-dimensional cross-polytope).at n=25A008412
• A convolution triangle of numbers obtained from A034255.at n=32A048882
• Number of columns with an odd sum in all 2-compositions of n. A 2-composition of n is a nonnegative matrix with two rows, such that each column has at least one nonzero entry and whose entries sum up to n.at n=8A181326
• Denominators of coefficients in asymptotic expansion of log z + psi(z+1/z), where psi is the digamma function.at n=20A222804
• A bisection of A222804.at n=10A222806
• Smallest member of bi-unitary sociable quadruples.at n=5A319915
• a(n) is the smallest k > 1 such that k^n + 1 has all prime divisors p == 1 (mod n).at n=54A352597
• Expansion of e.g.f. (exp(x)-1)*(exp(x)-x)*(exp(x)-x^2/2).at n=10A358341
• Smallest members of infinitary sociable quadruples.at n=3A361811