31109

Appears in sequences

• Expansion of cosh(x)*cosh(log(1+x)).at n=8A009178
• Concatenate all the prime divisors in previous term (with repetition), starting at 49.at n=4A056938
• (1/8)*number of lattice points with odd indices in a cubic lattice inside a sphere around the origin with radius 2*n.at n=38A120884
• Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-0011 pattern in any orientation.at n=11A147466
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, -1), (0, 1, 1), (1, -1, 1), (1, 0, -1)}.at n=9A148991
• Number of nondecreasing arrangements of n+3 numbers in 0..4 with each number being the sum mod 5 of three others.at n=23A183899
• a(n) = n*(n^3+n^2+2*n+1).at n=13A186636
• Trajectory of 407 under the map x -> A084317(x).at n=3A343157
• a(n) is the first number k such that k^i is a quasi-Niven number (A209871) for 1<=i<=n but not for i=n+1.at n=4A356978