31471

Appears in sequences

• Strong pseudoprimes to base 96.at n=19A020322
• Number of distinct lines through the origin in the n-dimensional lattice of side length 7.at n=5A090023
• Number of distinct lines through the origin in 5-dimensional cube of side length n.at n=7A090027
• Triangle read by rows: T(n,k) is the number of L-convex polyominoes of semiperimeter n, having k maximal rectangles (n >= 2, 1 <= k <= floor(n/2)). An L-convex polyomino is a convex polyomino in which any two cells can be connected by a path internal to the polyomino and which has at most 1 change of direction (i.e., one of the four orientations of the letter L). A maximal rectangle in an L-convex polyomino P is a rectangle included in P that is maximal with respect to inclusion.at n=32A181368
• Expansion of (1+x)^4/(1-x)^7.at n=9A191596
• a(n) = A278332(n+1)/(n+1) for n>=0.at n=6A278333
• a(1) = 1, a(2) = 2, a(3) = 3; for n > 3, a(n) is the smallest positive number which has not appeared such that all the distinct prime factors of a(n-3) + a(n-2) + a(n-1) are factors of a(n).at n=28A361593